Country name 1980 1981 1982 1983 1984
China 3 3 3 3 3
Germany 5 5 5 5 5
India 6 6 5 5 5
Ukraine 7 7 7 7 7
Poland 8 7 7 7 7
Russian Federation 8 8 8 8 8
Italy 9 9 9 9 9
United States 9 9 9 9 9
Netherlands 10 10 10 10 10
Kazakhstan 12 12 12 12 12
Sweden 14 14 14 14 15
Slovak Republic 15 15 15 15 15
Brazil 15 15 15 14 14
Czech Republic 15 15 15 15 15
Spain 16 16 15 15 15
Nigeria 16 16 16 16 16
Canada 16 16 16 17 17
Saudi Arabia 16 16 16 16 16
Malaysia 17 17 18 18 19
United Kingdom 17 17 17 18 18
Belgium 18 18 18 18 18
Romania 18 18 18 18 17
Indonesia 19 18 18 17 17
Korea, Dem. Rep. 19 19 19 20 20
South Sudan 19 19 19 19 18
Algeria 19 18 17 17 16
Bulgaria 20 20 20 20 20
Switzerland 20 20 20 20 20
Finland 20 20 20 20 19
Cameroon 20 20 20 20 20
Yemen, Rep. 20 19 20 21 22
Colombia 21 21 21 21 21
Sri Lanka 21 21 21 21 21
France 21 21 21 21 21
Bosnia and Herzegovina 21 21 22 22 22
Venezuela, RB 22 21 21 20 20
Oman 22 22 22 23 23
Norway 22 22 22 22 22
Pakistan 22 22 22 22 22
Turkey 23 23 22 22 21
Zambia 23 23 23 23 23
Lithuania 24 24 24 24 24
South Africa 24 24 23 23 23
Turkmenistan 24 24 24 24 24
Belarus 24 24 24 24 24
Denmark 26 25 25 25 25
Ghana 26 26 25 25 25
Nepal 26 25 25 25 25
Australia 26 26 26 26 26
Morocco 26 26 25 25 25
Vietnam 26 26 26 25 25
Iran, Islamic Rep. 26 26 25 24 24
Bangladesh 27 26 27 27 28
Uzbekistan 28 28 27 27 27
Mexico 28 28 27 27 27
Croatia 28 28 28 28 28
Cuba 29 28 28 28 28
Congo, Dem. Rep. 29 30 31 31 32
Myanmar 29 29 29 28 28
Papua New Guinea 29 29 29 30 30
Honduras 29 29 29 29 29
New Zealand 30 30 30 30 30
Hungary 30 30 30 30 29
Ecuador 30 30 30 30 30
Libya 31 30 29 28 27
United Arab Emirates 31 31 31 31 32
Austria 31 31 31 31 31
Tanzania 31 31 31 31 31
Ethiopia 32 32 32 32 32
Japan 32 32 32 32 33
Nicaragua 32 32 32 32 33
Tunisia 32 32 32 32 32
Syrian Arab Republic 33 33 32 32 31
Bolivia 33 33 32 31 31
Benin 33 33 32 32 32
Philippines 34 33 32 31 30
Somalia 34 34 35 38 41
Kenya 34 34 34 34 34
El Salvador 34 34 35 35 35
Mozambique 35 33 31 29 28
Niger 35 35 35 35 35
Iraq 35 35 34 34 34
Madagascar 36 36 36 36 36
Cambodia 36 43 43 42 40
Namibia 36 36 37 37 37
Bahrain 36 36 35 34 34
Thailand 37 37 37 37 36
Egypt, Arab Rep. 37 37 37 38 38
Tajikistan 38 38 37 37 37
Zimbabwe 38 37 35 35 35
Moldova 38 38 38 38 38
Chad 38 38 39 39 39
Korea, Rep. 38 38 37 36 36
Sierra Leone 38 39 39 40 40
Kyrgyz Republic 39 38 38 38 38
Mali 39 39 39 39 39
Macedonia, FYR 39 40 39 39 39
Peru 40 40 40 39 39
Argentina 40 40 40 39 39
Sudan 40 41 41 41 41
Dominican Republic 40 41 41 41 40
Chile 41 41 42 42 42
Israel 42 43 43 44 45
Estonia 43 43 43 43 43
Malawi 44 43 43 43 42
Guatemala 44 44 43 43 42
Burkina Faso 44 44 44 44 44
Greece 45 45 44 44 44
Central African Republic 45 45 44 44 44
Cote d'Ivoire 45 45 45 45 45
Mauritania 46 46 47 48 48
Georgia 46 47 47 47 47
Afghanistan 47 50 53 56 60
Ireland 48 48 47 47 46
Mongolia 48 48 47 47 47
Senegal 48 48 48 48 48
Azerbaijan 48 48 48 47 47
Jordan 49 47 45 44 43
Djibouti 49 49 51 54 58
Liberia 49 49 50 50 52
Uganda 50 49 47 46 45
Latvia 50 50 50 50 50
Armenia 51 51 51 50 50
Angola 51 51 50 49 50
Togo 51 52 51 50 49
Jamaica 52 51 50 49 49
Congo, Rep. 52 53 53 54 55
Costa Rica 52 52 52 52 52
Lao PDR 52 52 50 49 48
Rwanda 53 53 54 54 54
Paraguay 58 57 57 56 55
Puerto Rico 58 58 58 58 59
Uruguay 58 58 58 58 58
Portugal 59 59 58 57 56
Gabon 59 58 57 57 57
Haiti 60 61 62 61 60
Panama 61 61 61 62 62
Guinea 62 60 59 58 57
Kuwait 69 68 67 67 67
Gambia, The 71 71 71 71 70
Eritrea 73 71 70 68 67
Qatar 76 73 70 66 64
Guinea-Bissau 80 79 77 75 73
Lebanon 85 84 84 80 77
Burundi 93 91 88 85 82
Hong Kong SAR, China 100 99 99 99 99
Macao SAR, China 100 100 100 100 100
Singapore 100 97 95 96 97
St. Vincent and the Grenadines
Micronesia, Fed. Sts.
Tuvalu
Mauritius
Monaco
Marshall Islands
Antigua and Barbuda
Malta
Fiji
Maldives
Cayman Islands
Montenegro
Barbados
Luxembourg
American Samoa
Liechtenstein
Suriname
Lesotho
Equatorial Guinea
Samoa
Tonga
San Marino
Palau
Sao Tome and Principe
New Caledonia
Kosovo
Vanuatu
Kiribati
West Bank and Gaza
Serbia
Northern Mariana Islands
Seychelles
French Polynesia
Isle of Man
Swaziland
Cyprus
Faeroe Islands
Timor-Leste
Dominica
Sint Maarten (Dutch part)
Curacao
Iceland
Comoros
Slovenia
Trinidad and Tobago
Solomon Islands
Cabo Verde
Botswana
Turks and Caicos Islands
Bermuda
Brunei Darussalam
Guyana
Bhutan
Guam
Belize
Grenada
Bahamas, The
Greenland
Aruba
St. Kitts and Nevis
Virgin Islands (U.S.)
St. Lucia
Andorra
St. Martin (French part)
Albania

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