Country name 1986 1987 1988 1989 1990
Nepal 2 2 2 2 2
Rwanda 3 3 3 3 3
Ethiopia 4 4 4 4 4
Uganda 4 4 4 4 4
Poland 4 4 4 4 4
Yemen, Rep. 4 5 5 5 5
Mozambique 5 5 6 6 6
Niger 5 5 5 5 6
Tanzania 5 5 6 6 6
Burkina Faso 6 6 6 6 6
Cambodia 6 6 6 7 7
Netherlands 6 6 6 6 6
Kazakhstan 7 7 7 7 7
Algeria 7 7 7 7 7
Vietnam 7 7 7 7 7
Madagascar 8 8 8 8 8
Kenya 8 8 8 8 8
Chad 8 8 8 8 8
Bangladesh 8 8 8 9 9
Mali 8 8 8 9 9
Myanmar 8 8 8 8 8
Romania 9 9 9 9 9
Germany 9 9 9 9 9
China 9 9 9 9 10
Zimbabwe 9 9 9 10 10
Zambia 9 9 9 9 9
Malaysia 10 10 10 11 12
Sudan 10 10 11 11 12
India 10 10 10 10 11
Indonesia 10 10 10 10 10
Ukraine 10 10 10 10 10
Thailand 10 10 10 11 11
Uzbekistan 11 11 10 10 10
Nigeria 11 11 11 12 12
Honduras 11 12 12 12 12
Afghanistan 11 12 12 13 13
Czech Republic 12 12 12 12 12
Korea, Dem. People’s Rep. 12 12 12 12 13
Sweden 12 12 12 12 12
Ghana 12 12 13 13 13
Cameroon 13 13 14 14 14
Somalia 13 14 15 15 16
Angola 13 14 14 15 15
Bulgaria 13 13 13 13 14
Switzerland 13 14 14 15 15
Philippines 14 14 14 14 14
Haiti 14 15 15 16 16
Belarus 15 15 16 16 16
Finland 15 16 16 17 17
Guinea 15 15 15 15 15
Guatemala 16 16 16 16 16
Pakistan 17 17 17 17 17
Cote d'Ivoire 17 17 17 17 17
Belgium 17 17 17 17 17
Tunisia 17 17 17 18 18
El Salvador 17 17 18 18 18
Russian Federation 17 17 18 18 17
Senegal 18 18 18 19 19
Italy 19 19 19 19 19
Hungary 19 19 19 19 19
Libya 20 20 20 20 20
Morocco 20 20 20 20 21
Cuba 20 20 20 20 20
Austria 20 20 20 20 20
Denmark 21 20 20 20 20
Dominican Republic 21 21 21 21 21
Spain 22 22 22 22 22
Congo, Dem. Rep. 22 22 22 23 23
France 22 22 22 22 22
Egypt, Arab Rep. 23 23 23 23 23
Costa Rica 24 24 24 25 25
Turkey 24 25 25 25 26
Iran, Islamic Rep. 24 24 24 24 24
Azerbaijan 25 25 25 24 24
Paraguay 25 25 25 26 26
New Zealand 25 25 26 26 26
Georgia 25 26 26 26 25
Ecuador 25 26 26 26 26
Mongolia 26 26 26 26 26
Ireland 26 26 26 26 26
Peru 26 26 26 27 27
Liberia 27 31 36 42 50
United Kingdom 27 27 27 27 27
Jordan 28 27 27 27 27
South Africa 28 28 28 28 29
Congo, Rep. 29 29 29 29 29
Bolivia 29 29 30 31 32
Iraq 30 30 31 31 31
Greece 31 31 30 30 30
Colombia 31 31 31 31 32
Saudi Arabia 31 32 33 35 36
Panama 33 33 34 34 34
Syrian Arab Republic 33 33 33 33 33
Mexico 33 34 34 34 35
Armenia 34 33 33 33 33
Venezuela, RB 34 34 33 33 33
Brazil 34 34 34 35 35
Chile 35 35 35 35 35
Portugal 37 37 37 37 37
Canada 38 39 39 39 40
Argentina 40 39 39 39 39
United States 42 42 42 42 42
Korea, Rep. 47 48 49 50 51
Uruguay 50 50 50 50 50
Puerto Rico 54 57 60 63 66
Israel 55 56 57 58 58
Japan 56 57 57 58 58
Lebanon 58 57 56 52 48
United Arab Emirates 58 58 58 57 57
Australia 61 61 61 61 61
Kuwait 64 64 64 65 68
Hong Kong SAR, China 94 96 99 100 100
Singapore 100 100 100 100 99
Burundi
Macedonia, FYR
Latvia
Lithuania
Malawi
St. Kitts and Nevis
Lao PDR
Trinidad and Tobago
Slovak Republic
West Bank and Gaza
Maldives
Kyrgyz Republic
Comoros
Malta
Cayman Islands
Marshall Islands
Bosnia and Herzegovina
Mauritania
Turks and Caicos Islands
Mauritius
Liechtenstein
Luxembourg
Macao SAR, China
Micronesia, Fed. Sts.
Moldova
Solomon Islands
Monaco
Central African Republic
Kiribati
St. Martin (French part)
Montenegro
Swaziland
Jamaica
Tajikistan
Isle of Man
Togo
Iceland
Bermuda
Namibia
Benin
Lesotho
Bahrain
Curacao
Antigua and Barbuda
Seychelles
American Samoa
Guyana
Cyprus
New Caledonia
Serbia 15
Guinea-Bissau
Sierra Leone
Nicaragua
Sint Maarten (Dutch part)
Guam
Slovenia
Grenada
Croatia
Northern Mariana Islands
South Sudan
Norway
Sri Lanka
Oman
St. Lucia
Greenland
St. Vincent and the Grenadines
Palau
Suriname
Gambia, The
Cabo Verde
Papua New Guinea
Brunei Darussalam
Gabon
Botswana
French Polynesia
Timor-Leste
Fiji
Tonga
Faroe Islands
Bhutan
Estonia
Turkmenistan
Eritrea
Tuvalu
Qatar
Belize
Equatorial Guinea
Barbados
Vanuatu
Bahamas, The
Dominica
Djibouti
Aruba
Samoa
Virgin Islands (U.S.)
San Marino
Andorra
Sao Tome and Principe
Albania

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