Geography - note:

the mainland terrain is flat, boggy, and partly wooded; offshore lie

more than 1,500 islands

People

Estonia

Population:

1,307,605 (July 2008 est.)

Age structure:

0-14 years: 14.9% (male 100,143/female 94,450)

15-64 years: 67.5% (male 420,896/female 462,072)

65 years and over: 17.6% (male 76,171/female 153,873) (2008 est.)

Median age:

total: 39.6 years

male: 36.2 years

female: 43.2 years (2008 est.)

Population growth rate:

-0.632% (2008 est.)

Birth rate:

10.28 births/1,000 population (2008 est.)

Death rate:

13.35 deaths/1,000 population (2008 est.)

Net migration rate:

-3.24 migrant(s)/1,000 population (2008 est.)

Sex ratio:

at birth: 1.06 male(s)/female

under 15 years: 1.06 male(s)/female

15-64 years: 0.91 male(s)/female

65 years and over: 0.5 male(s)/female

total population: 0.84 male(s)/female (2008 est.)

Infant mortality rate:

total: 7.45 deaths/1,000 live births

male: 8.62 deaths/1,000 live births

female: 6.21 deaths/1,000 live births (2008 est.)

Life expectancy at birth:

total population: 72.56 years

male: 67.16 years

female: 78.3 years (2008 est.)

Total fertility rate:

1.42 children born/woman (2008 est.)

HIV/AIDS - adult prevalence rate:

1.1% (2001 est.)

HIV/AIDS - people living with HIV/AIDS:

7,800 (2003 est.)

HIV/AIDS - deaths:

fewer than 200 (2003 est.)

Major infectious diseases:

degree of risk: intermediate

food or waterborne diseases: bacterial diarrhea and hepatitis A

vectorborne disease: tickborne encephalitis (2008)

Nationality:

noun: Estonian(s)

adjective: Estonian

Ethnic groups:

Estonian 67.9%, Russian 25.6%, Ukrainian 2.1%, Belarusian 1.3%, Finn

0.9%, other 2.2% (2000 census)

Religions:

Evangelical Lutheran 13.6%, Orthodox 12.8%, other Christian

(including Methodist, Seventh-Day Adventist, Roman Catholic,

Pentecostal) 1.4%, unaffiliated 34.1%, other and unspecified 32%,

none 6.1% (2000 census)

Languages:

Estonian (official) 67.3%, Russian 29.7%, other 2.3%, unknown 0.7%

(2000 census)

Literacy:

definition: age 15 and over can read and write

total population: 99.8%

male: 99.8%

female: 99.8% (2000 census)

School life expectancy (primary to tertiary education):

total: 16 years

male: 15 years

female: 17 years (2006)

Education expenditures:

5.1% of GDP (2004)

Government

Estonia

Country name:

conventional long form: Republic of Estonia

conventional short form: Estonia

local long form: Eesti Vabariik

local short form: Eesti

former: Estonian Soviet Socialist Republic

Government type:

parliamentary republic

Capital:

name: Tallinn

geographic coordinates: 59 26 N, 24 43 E

time difference: UTC+2 (7 hours ahead of Washington, DC during

Standard Time)

daylight saving time: +1hr, begins last Sunday in March; ends last

Sunday in October

Administrative divisions:

15 counties (maakonnad, singular - maakond): Harjumaa (Tallinn),

Hiiumaa (Kardla), Ida-Virumaa (Johvi), Jarvamaa (Paide), Jogevamaa

(Jogeva), Laanemaa (Haapsalu), Laane-Virumaa (Rakvere), Parnumaa

(Parnu), Polvamaa (Polva), Raplamaa (Rapla), Saaremaa (Kuressaare),

Tartumaa (Tartu), Valgamaa (Valga), Viljandimaa (Viljandi), Vorumaa

(Voru)

note: counties have the administrative center name following in

parentheses

Independence:

20 August 1991 (from Soviet Union)

National holiday:

Independence Day, 24 February (1918); note - 24 February 1918 was

the date Estonia declared its independence from Soviet Russia; 20

August 1991 was the date it declared its independence from the

Soviet Union

Constitution:

adopted 28 June 1992

Legal system:

based on civil law system; accepts compulsory ICJ jurisdiction with

reservations

Suffrage:

18 years of age; universal for all Estonian citizens

Executive branch:

chief of state: President Toomas Hendrik ILVES (since 9 October 2006)

head of government: Prime Minister Andrus ANSIP (since 12 April 2005)

cabinet: Council of Ministers appointed by the prime minister,

approved by Parliament

elections: president elected by Parliament for a five-year term

(eligible for a second term); if a candidate does not secure

two-thirds of the votes after three rounds of balloting in the

Parliament, then an electoral assembly (made up of Parliament plus

members of local governments) elects the president, choosing between

the two candidates with the largest percentage of votes; election

last held 23 September 2006 (next to be held in the fall of 2011);

prime minister nominated by the president and approved by Parliament

election results: Toomas Hendrik ILVES elected president on 23

September 2006 by a 345-member electoral assembly; ILVES received

174 votes to incumbent Arnold RUUTEL's 162; remaining 9 ballots left

blank or invalid

Legislative branch:

unicameral Parliament or Riigikogu (101 seats; members are elected

by popular vote to serve four-year terms)

elections: last held 4 March 2007 (next to be held in March 2011)

election results: percent of vote by party - Estonian Reform Party

27.8%, Center Party of Estonia 26.1%, Union of Pro Patria and Res

Publica 17.9%, Social Democratic Party 10.6%, Estonian Greens 7.1%,

Estonian People's Union 7.1%, other 5%; seats by party - Estonian

Reform Party 31, Center Party 29, Union of Pro Patria and Res

Publica 19, Social Democratic Party 10, Estonian Greens 6, Estonian

People's Union 6

Judicial branch:

National Court (chairman appointed by Parliament for life)

Political parties and leaders:

Center Party of Estonia (Keskerakond) [Edgar SAVISAAR]; Estonian

Greens (Rohelised) [Marek STRANDBERG]; Estonian People's Union

(Rahvaliit) [Villu REILJAN]; Estonian Reform Party (Reformierakond)

[Andrus ANSIP]; Estonian United Russian People's Party or EUVRP

[Yevgeniy TOMBERG]; Social Democratic Party (formerly People's Party

Moodukad or Moderates) [Ivari PADAR]; Union of Pro Patria and Res

Publica (Isamaa je Res Publica Liit) [Mart LAAR]

Political pressure groups and leaders:

Nochnoy Dozor/Night Watch anti-fascist movement (leader Alexander

KOROBOV)

International organization participation:

Australia Group, BA, BIS, CBSS, CE, EAPC, EBRD, EIB, EU, FAO, IAEA,

IBRD, ICAO, ICCt, ICRM, IDA, IFC, IFRCS, IHO, ILO, IMF, IMO,

Interpol, IOC, IOM, IPU, ISO (correspondent), ITU, ITUC, MIGA, NATO,

NIB, NSG, OAS (observer), OPCW, OSCE, PCA, Schengen Convention, UN,

UNCTAD, UNESCO, UNHCR, UNITAR, UNTSO, UPU, WCO, WEU (associate

partner), WFTU, WHO, WIPO, WMO, WTO

Diplomatic representation in the US:

chief of mission: Ambassador Vaino REINART

chancery: 2131 Massachusetts Avenue NW, Washington, DC 20008

telephone: [1] (202) 588-0101

FAX: [1] (202) 588-0108

consulate(s) general: New York

Diplomatic representation from the US:

chief of mission: Ambassador Stanley Davis PHILLIPS

embassy: Kentmanni 20, 15099 Tallinn

mailing address: use embassy street address

telephone: [372] 668-8100

FAX: [372] 668-8265

Flag description:

pre-1940 flag restored by Supreme Soviet in May 1990 - three equal

horizontal bands of blue (top), black, and white

Economy

Estonia

Economy - overview:

Estonia, a 2004 European Union entrant, has a modern market-based

economy and one of the highest per capita income levels in Central

Europe. The economy benefits from strong electronics and

telecommunications sectors and strong trade ties with Finland,

Sweden, and Germany. The current government has pursued relatively

sound fiscal policies, resulting in balanced budgets and low public

debt. In 2007, however, a large current account deficit and rising

inflation put pressure on Estonia's currency, which is pegged to the

euro, highlighting the need for growth in export-generating

industries.

GDP (purchasing power parity):

$28.69 billion (2007 est.)

GDP (official exchange rate):

$21.28 billion (2007 est.)

GDP - real growth rate:

7.1% (2007 est.)

GDP - per capita (PPP):

$21,800 (2007 est.)

GDP - composition by sector:

agriculture: 3%

industry: 28.5%

services: 68.5% (2007 est.)

Labor force:

687,000 (2007 est.)

Labor force - by occupation:

agriculture: 11%

industry: 20%

services: 69% (1999 est.)

Unemployment rate:

4.7% (2007 est.)

Population below poverty line:

5% (2003)

Household income or consumption by percentage share:

lowest 10%: 2.5%

highest 10%: 27.6% (2003)

Distribution of family income - Gini index:

34 (2005)

Investment (gross fixed):

31.9% of GDP (2007 est.)

Budget:

revenues: $7.854 billion

expenditures: $7.171 billion (2007 est.)

Fiscal year:

calendar year

Public debt:

3.4% of GDP (2007 est.)

Inflation rate (consumer prices):

6.6% (2007 est.)

Commercial bank prime lending rate:

6.46% (31 December 2007)

Stock of money:

$7.158 billion (31 December 2007)

Stock of quasi money:

$4.253 billion (31 December 2007)

Stock of domestic credit:

$21.35 billion (31 December 2007)

Agriculture - products:

potatoes, vegetables; livestock and dairy products; fish

Industries:

engineering, electronics, wood and wood products, textiles;

information technology, telecommunications

Industrial production growth rate:

7.7% (2007 est.)

Electricity - production:

9.158 billion kWh (2006 est.)

Electricity - consumption:

7.331 billion kWh (2006 est.)

Electricity - exports:

3.179 billion kWh (2007 est.)

Electricity - imports:

400 million kWh (2007 est.)

Electricity - production by source:

fossil fuel: 99.8%

hydro: 0.1%

nuclear: 0%

other: 0.2% (2001)

Oil - production:

7,430 bbl/day (2007 est.)

Oil - consumption:

30,440 bbl/day (2006 est.)

Oil - exports:

7,000 bbl/day (2005)

Oil - imports:

28,170 bbl/day (2005)

Oil - proved reserves:

0 bbl (1 January 2006 est.)

Natural gas - production:

0 cu m (2007 est.)

Natural gas - consumption:

1.48 billion cu m (2007 est.)

Natural gas - exports:

0 cu m (2007 est.)

Natural gas - imports:

1.48 billion cu m (2007 est.)

Natural gas - proved reserves:

0 cu m (1 January 2006 est.)

Current account balance:

-$3.771 billion (2007 est.)

Exports:

$11.08 billion f.o.b. (2007 est.)

Exports - commodities:

machinery and equipment 33%, wood and paper 15%, textiles 14%, food

products 8%, furniture 7%, metals, chemical products (2001)

Exports - partners:

Finland 17.9%, Sweden 13.2%, Latvia 11.4%, Russia 8.9%, Lithuania

5.8%, Germany 5.2%, US 4.1% (2007)

Imports:

$14.75 billion f.o.b. (2007 est.)

Imports - commodities:

machinery and equipment 33.5%, chemical products 11.6%, textiles

10.3%, foodstuffs 9.4%, transportation equipment 8.9% (2001)

Imports - partners:

Finland 15.9%, Germany 12.8%, Sweden 10.1%, Russia 10%, Latvia 7.6%,

Lithuania 6.9%, Poland 4.5% (2007)

Economic aid - recipient:

$135.5 million (2004)

Reserves of foreign exchange and gold:

$3.27 billion (31 December 2007 est.)

Debt - external:

$24.82 billion (30 June 2007)

Stock of direct foreign investment - at home:

$16.59 billion (2007 est.)

Stock of direct foreign investment - abroad:

$5.873 billion (2007 est.)

Market value of publicly traded shares:

$5.963 billion (2006)

Currency (code):

Estonian kroon (EEK)

Currency code:

EEK

Exchange rates:

krooni (EEK) per US dollar - 11.535 (2007), 12.473 (2006), 12.584

(2005), 12.596 (2004), 13.856 (2003)

note: the krooni is pegged to the euro

Communications

Estonia

Telephones - main lines in use:

495,500 (2007)

Telephones - mobile cellular:

1.982 million (2007)

Telephone system:

general assessment: foreign investment in the form of joint business

ventures greatly improved telephone service; substantial fiber-optic

cable systems carry telephone, TV, and radio traffic in the digital

mode; Internet services are widely available; schools and libraries

are connected to the Internet, a large percentage of the population

files income-tax returns online, and online voting was used for the

first time in the 2005 local elections

domestic: a wide range of high quality voice, data, and Internet

services is available throughout the country

international: country code - 372; fiber-optic cables to Finland,

Sweden, Latvia, and Russia provide worldwide packet-switched

service; 2 international switches are located in Tallinn (2001)

Radio broadcast stations:

AM 0, FM 98, shortwave 0 (2001)

Radios:

1.01 million (1997)

Television broadcast stations:

3 (2001)

Televisions:

605,000 (1997)

Internet country code:

.ee

Internet hosts:

645,495 (2008)

Internet Service Providers (ISPs):

38 (2001)

Internet users:

780,000 (2007)

Transportation

Estonia

Airports:

19 (2007)

Airports - with paved runways:

total: 12

over 3,047 m: 1

2,438 to 3,047 m: 7

1,524 to 2,437 m: 1

914 to 1,523 m: 3 (2007)

Airports - with unpaved runways:

total: 7

over 3,047 m: 1

1,524 to 2,437 m: 2

914 to 1,523 m: 1

under 914 m: 3 (2007)

Heliports:

1 (2007)

Pipelines:

gas 859 km (2007)

Railways:

total: 968 km

broad gauge: 968 km 1.520 m/1.524-m gauge (2006)

Roadways:

total: 57,016 km

paved: 12,926 km (includes 99 km of expressways)

unpaved: 44,090 km (2005)

Waterways:

320 km (2006)

Merchant marine:

total: 29

by type: cargo 5, passenger/cargo 21, petroleum tanker 2, chemical

tanker 1

foreign-owned: 4 (Denmark 1, Germany 1, Norway 2)

registered in other countries: 85 (Antigua and Barbuda 23, Belize 6,

Cyprus 5, Dominica 7, Finland 2, Latvia 2, Liberia 1, Malta 11,

Norway 1, Panama 5, Saint Kitts and Nevis 3, Saint Vincent and the

Grenadines 16, Sweden 2, Vanuatu 1) (2008)

Ports and terminals:

Kuivastu, Kunda, Muuga, Tallinn, Virtsu

Military

Estonia

Military branches:

Estonian Defense Forces: Land Force, Navy, Air Force (Eesti

Ohuvagi), Volunteer Defense League (Kaitseliit, KL) (2008)

Military service age and obligation:

compulsory military service for men between 19 and 28; conscription

lasts 11 months for junior NCOs and reserve platoon leaders; reserve

officers and designated specialists have a different conscript

service obligation; Estonia has committed to retaining conscription

for men up to 2010 and, unlike Latvia and Lithuania, has no plan to

transition to a contract armed forces; 17 years of age for

volunteers; reserve commitment up to the age of 60 (2006)

Manpower available for military service:

males age 16-49: 306,273

females age 16-49: 317,852 (2008 est.)

Manpower fit for military service:

males age 16-49: 218,448

females age 16-49: 264,187 (2008 est.)

Manpower reaching militarily significant age annually:

male: 8,322

female: 7,846 (2008 est.)

Military expenditures:

2% of GDP (2005 est.)

Transnational Issues

Estonia

Disputes - international:

Russia recalled its signature to the 1996 technical border agreement

with Estonia in 2005, rather than concede to Estonia's appending

prepared a unilateral declaration referencing Soviet occupation and

territorial losses; Russia demands better accommodation of

Russian-speaking population in Estonia; Estonian citizen groups

continue to press for realignment of the boundary based on the 1920

Tartu Peace Treaty that would bring the now divided ethnic Setu

people and parts of the Narva region within Estonia; as a member

state that forms part of the EU's external border, Estonia must

implement the strict Schengen border rules with Russia

Illicit drugs:

growing producer of synthetic drugs; increasingly important

transshipment zone for cannabis, cocaine, opiates, and synthetic

drugs since joining the European Union and the Schengen Accord;

potential money laundering related to organized crime and drug

trafficking is a concern, as is possible use of the gambling sector

to launder funds; major use of opiates and ecstasy

This page was last updated on 18 December, 2008

======================================================================

@Ethiopia

Introduction

Ethiopia

Background:

Unique among African countries, the ancient Ethiopian monarchy

maintained its freedom from colonial rule with the exception of the

1936-41 Italian occupation during World War II. In 1974, a military

junta, the Derg, deposed Emperor Haile SELASSIE (who had ruled since

1930) and established a socialist state. Torn by bloody coups,

uprisings, wide-scale drought, and massive refugee problems, the

regime was finally toppled in 1991 by a coalition of rebel forces,

the Ethiopian People's Revolutionary Democratic Front (EPRDF). A

constitution was adopted in 1994, and Ethiopia's first multiparty

elections were held in 1995. A border war with Eritrea late in the

1990s ended with a peace treaty in December 2000. The

Eritrea-Ethiopia Border Commission in November 2007 remotely

demarcated the border by geographical coordinates, but final

demarcation of the boundary on the ground is currently on hold

because of Ethiopian objections to an international commission's

finding requiring it to surrender territory considered sensitive to

Ethiopia.

Geography

Ethiopia

Location:

Eastern Africa, west of Somalia

Geographic coordinates:

8 00 N, 38 00 E

Map references:

Africa

Area:

total: 1,127,127 sq km

land: 1,119,683 sq km

water: 7,444 sq km

Area - comparative:

slightly less than twice the size of Texas

Land boundaries:

total: 5,328 km

border countries: Djibouti 349 km, Eritrea 912 km, Kenya 861 km,

Somalia 1,600 km, Sudan 1,606 km

Coastline:

0 km (landlocked)

Maritime claims:

none (landlocked)

Climate:

tropical monsoon with wide topographic-induced variation

Terrain:

high plateau with central mountain range divided by Great Rift Valley

Elevation extremes:

lowest point: Denakil Depression -125 m

highest point: Ras Dejen 4,533 m

Natural resources:

small reserves of gold, platinum, copper, potash, natural gas,

hydropower

Land use:

arable land: 10.01%

permanent crops: 0.65%

other: 89.34% (2005)

Irrigated land:

2,900 sq km (2003)

Total renewable water resources:

110 cu km (1987)

Freshwater withdrawal (domestic/industrial/agricultural):

total: 5.56 cu km/yr (6%/0%/94%)

per capita: 72 cu m/yr (2002)

Natural hazards:

geologically active Great Rift Valley susceptible to earthquakes,

volcanic eruptions; frequent droughts

Environment - current issues:

deforestation; overgrazing; soil erosion; desertification; water

shortages in some areas from water-intensive farming and poor

management

Environment - international agreements:

party to: Biodiversity, Climate Change, Climate Change-Kyoto

Protocol, Desertification, Endangered Species, Hazardous Wastes,

Ozone Layer Protection

signed, but not ratified: Environmental Modification, Law of the Sea

Geography - note:

landlocked - entire coastline along the Red Sea was lost with the de

jure independence of Eritrea on 24 May 1993; the Blue Nile, the

chief headstream of the Nile by water volume, rises in T'ana Hayk

(Lake Tana) in northwest Ethiopia; three major crops are believed to

have originated in Ethiopia: coffee, grain sorghum, and castor bean

People

Ethiopia

Population:

82,544,840

note: estimates for this country explicitly take into account the

effects of excess mortality due to AIDS; this can result in lower

life expectancy, higher infant mortality, higher death rates, lower

population growth rates, and changes in the distribution of

population by age and sex than would otherwise be expected (July

2008 est.)

Age structure:

0-14 years: 46% (male 18,922,334/female 19,017,593)

15-64 years: 51.4% (male 20,749,002/female 21,656,509)

65 years and over: 2.7% (male 947,323/female 1,252,077) (2008 est.)

Median age:

total: 16.9 years

male: 16.6 years

female: 17.2 years (2008 est.)

Population growth rate:

3.212% (2008 est.)

Birth rate:

43.97 births/1,000 population (2008 est.)

Death rate:

11.83 deaths/1,000 population (2008 est.)

Net migration rate:

NA

note: repatriation of Ethiopian refugees residing in Sudan is

expected to continue for several years; some Sudanese, Somali, and

Eritrean refugees, who fled to Ethiopia from the fighting or famine

in their own countries, continue to return to their homes (2008 est.)

Sex ratio:

at birth: 1.03 male(s)/female

under 15 years: 1 male(s)/female

15-64 years: 0.96 male(s)/female

65 years and over: 0.76 male(s)/female

total population: 0.97 male(s)/female (2008 est.)

Infant mortality rate:

total: 82.64 deaths/1,000 live births

male: 94.08 deaths/1,000 live births

female: 70.87 deaths/1,000 live births (2008 est.)

Life expectancy at birth:

total population: 54.99 years

male: 52.54 years

female: 57.51 years (2008 est.)

Total fertility rate:

6.17 children born/woman (2008 est.)

HIV/AIDS - adult prevalence rate:

4.4% (2003 est.)

HIV/AIDS - people living with HIV/AIDS:

1.5 million (2003 est.)

HIV/AIDS - deaths:

120,000 (2003 est.)

Major infectious diseases:

degree of risk: high

food or waterborne diseases: bacterial and protozoal diarrhea,

hepatitis A and E, and typhoid fever

vectorborne diseases: malaria

respiratory disease: meningococcal meningitis

animal contact disease: rabies

water contact disease: schistosomiasis (2008)

Nationality:

noun: Ethiopian(s)

adjective: Ethiopian

Ethnic groups:

Oromo 32.1%, Amara 30.1%, Tigraway 6.2%, Somalie 5.9%, Guragie 4.3%,

Sidama 3.5%, Welaita 2.4%, other 15.4% (1994 census)

Religions:

Christian 60.8% (Orthodox 50.6%, Protestant 10.2%), Muslim 32.8%,

traditional 4.6%, other 1.8% (1994 census)

Languages:

Amarigna 32.7%, Oromigna 31.6%, Tigrigna 6.1%, Somaligna 6%,

Guaragigna 3.5%, Sidamigna 3.5%, Hadiyigna 1.7%, other 14.8%,

English (major foreign language taught in schools) (1994 census)

Literacy:

definition: age 15 and over can read and write

total population: 42.7%

male: 50.3%

female: 35.1% (2003 est.)

School life expectancy (primary to tertiary education):

total: 8 years

male: 8 years

female: 7 years (2007)

Education expenditures:

6% of GDP (2006)

Government

Ethiopia

Country name:

conventional long form: Federal Democratic Republic of Ethiopia

conventional short form: Ethiopia

local long form: Ityop'iya Federalawi Demokrasiyawi Ripeblik

local short form: Ityop'iya

former: Abyssinia, Italian East Africa

abbreviation: FDRE

Government type:

federal republic

Capital:

name: Addis Ababa

geographic coordinates: 9 02 N, 38 42 E

time difference: UTC+3 (8 hours ahead of Washington, DC during

Standard Time)

Administrative divisions:

9 ethnically based states (kililoch, singular - kilil) and 2

self-governing administrations* (astedaderoch, singular -

astedader); Adis Abeba* (Addis Ababa), Afar, Amara (Amhara),

Binshangul Gumuz, Dire Dawa*, Gambela Hizboch (Gambela Peoples),

Hareri Hizb (Harari People), Oromiya (Oromia), Sumale (Somali),

Tigray, Ye Debub Biheroch Bihereseboch na Hizboch (Southern Nations,

Nationalities and Peoples)

Independence:

oldest independent country in Africa and one of the oldest in the

world - at least 2,000 years

National holiday:

National Day (defeat of MENGISTU regime), 28 May (1991)

Constitution:

ratified 8 December 1994, effective 22 August 1995

Legal system:

based on civil law; currently transitional mix of national and

regional courts; has not accepted compulsory ICJ jurisdiction

Suffrage:

18 years of age; universal

Executive branch:

chief of state: President GIRMA Woldegiorgis (since 8 October 2001)

head of government: Prime Minister MELES Zenawi (since August 1995)

cabinet: Council of Ministers as provided for in the December 1994

constitution; ministers are selected by the prime minister and

approved by the House of People's Representatives

elections: president elected by the House of People's

Representatives for a six-year term (eligible for a second term);

election last held 9 October 2007 (next to be held in October 2013);

prime minister designated by the party in power following

legislative elections

election results: GIRMA Woldegiorgis elected president; percent of

vote by the House of People's Representatives - 79%

Legislative branch:

The 2008 CIA World Factbook · 第 59 / 374 段