An already crowded world could have twice as many people in 40 years if current rates of increase continue, the private Population Reference Bureau reports.

Some countries are not expected to double at all, because they either are not increasing their populations, or are actually seeing declines.Here are the number of years it is expected to take each country to double its population at its current rate of increase.

COUNTRY YEARS Gaza 17

Kenya 17

Syria 18

Jordan 19

Maldives 19

Rwanda 19

Solomon Islands 19

Tanzania 19

Zambia 19

Botswana 20

Iraq 20

Nicaragua 20

Uganda 20

Zimbabwe 20

Comoros 21

Congo 21

Guatemala 21

Iran 21

Malawi 21

North Yemen 21

Oman 21

Saudi Arabia 21

South Yemen 21

Togo 21

Vanuatu 21

Algeria 22

Ghana 22

Honduras 22

Ivory Coast 22

Liberia 22

Libya 22

Belize 23

Benin 23

Ethiopia 23

Mauritania 23

Somalia 23

Swaziland 23

Zaire 23

Burkina Faso 24

Burundi 24

Costa Rica 24

Egypt 24

Kuwait 24

Mali 24

Namibia 24

Niger 24

Nigeria 24

Pakistan 24

Paraguay 24

Sudan 24

Western Samoa 24

Bahrain 25

Brunei 25

Ecuador 25

El Salvador 25

Haiti 25

Madagascar 25

Philippines 25

Qatar 25

Sao Tome-Principe 25

Bangladesh 26

Cameroon 26

Cape Verde 26

Mongolia 26

Senegal 26

Angola 27

Bolivia 27

Lesotho 27

Morocco 27

Mozambique 27

United Arab

Emirates 27

Vietnam 27

Central African

Rep. 28

Djibouti 28

Dominican

Republic 28

Laos 28

Malaysia 28

Nepal 28

North Korea 28

Peru 28

Venezuela 28

Western Sahara 28

Afghanistan 29

French Polynesia 29

Guinea 29

Guinea-Bissau 29

Mexico 29

Papua-New

Guinea 29

Cambodia 31

East Timor 31

Fiji 31

St. Lucia 31

South Africa 31

Trinidad-Tobago 31

Tunisia 31

Panama 32

Turkey 32

Albania 33

Burma 33

Suriname 33

Thailand 33

Bhutan 34

Brazil 34

Colombia 34

Gambia 34

Guyana 34

Lebanon 34

Chad 35

India 35

St.VincentGrenadines 35

Grenada 36

Bahamas 37

Equatorial Guinea 37

Seychelles 37

New Caledonia 38

Reunion 38

Sierra Leone 38

Sri Lanka 38

Indonesia 40

World 40

Jamaica 41

Macao 41

Israel 42

Domenica 44

Gabon 44

Argentina 45

Chile 45

China 49

Netherlands

Antilles 51

Sr. Kitts-Nevis 51

Guadeloupe 52

South Korea 52

Puerto Rico 56

Mauritius 58

Martinique 59

Cyprus 62

Taiwan 63

Soviet Union 68

Cuba 69

Antigua-Barbuda 71

Singapore 71

Iceland 79

Hong Kong 83

Uruguay 83

New Zealand 87

Australia 88

Barbados 88

Ireland 88

Canada 94

Malta 99

United States 99

Poland 100

Yugoslavia 110

Japan 133

Romania 141

Spain 154

France 166

Netherlands 169

Portugal 231

Finland 247

Switzwerland 277

Czechoslovakia 289

Greece 330

Norway 330

Bulgaria 385

United Kingdom 408

Sweden 673

Luxembourg 770

Belgium 1,034

Italy 3,465