| Country name | 2008 | 2009 | 2010 | 2011 | ||
|---|---|---|---|---|---|---|
| Macao SAR, China | 1.0 | 1.0 | 0.9 | 1.4 |
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| Rwanda | 2.2 | 4.3 | 3.2 |
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| Nigeria | 1.8 | 2.3 | 2.1 | 2.5 |
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| Turkey | 2.7 | 2.5 | 2.1 | 1.7 |
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| Saudi Arabia | 2.7 | 2.7 | 3.4 | 2.9 |
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| Iraq | 1.5 | 2.9 | 4.5 | 4.4 |
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| Vanuatu | 4.0 | 3.2 | 4.1 | 3.5 |
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| Fiji | 3.6 | 3.4 | 3.3 |
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| Solomon Islands | 12.5 | 3.6 | 4.6 | 4.3 |
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| Syrian Arab Republic | 5.5 | 4.5 | 2.5 |
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| Georgia | 4.1 | 5.1 | 4.5 | 4.6 |
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| Sudan | 6.2 | 6.0 | 29.5 | 6.3 |
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| Cape Verde | 5.6 | 6.0 | 4.7 | 5.4 |
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| Dominican Republic | 6.3 | 6.3 | 7.0 | 6.7 |
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| Angola | 6.8 | 5.9 | 6.0 |
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| Tunisia | 5.8 | 7.3 | 8.2 | 10.8 |
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| Bosnia and Herzegovina | 6.5 | 7.4 | 6.9 | 6.7 |
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| Greece | 6.6 | 7.4 | 7.6 | 7.7 |
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| Panama | 11.0 | 7.6 | 7.8 | 6.5 |
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| Antigua and Barbuda | 10.5 | 7.9 | 6.3 | 6.0 |
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| St. Lucia | 7.6 | 8.1 | 8.1 | 8.6 |
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| Montenegro | 9.0 | 8.2 | 8.4 | 8.2 |
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| Mongolia | 12.0 | 8.2 | 10.2 | 21.1 |
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| Albania | 12.0 | 8.4 | 10.8 | 10.5 |
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| Ethiopia | 6.7 | 8.4 | 8.9 | 6.0 |
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| Lithuania | 6.3 | 8.6 | 8.7 | 9.7 |
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| Yemen, Rep. | 9.0 | 8.6 | 6.7 | 8.7 |
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| Trinidad and Tobago | 8.3 | 9.0 | 6.5 |
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| Cambodia | 8.7 | 9.0 | 7.0 | 7.8 |
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| Jamaica | 7.5 | 9.1 | 8.4 | 7.8 |
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| Zambia | 9.0 | 9.2 | 8.7 | 8.1 |
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| New Caledonia | 9.3 | 10.3 | 12.2 | 12.7 |
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| Venezuela, RB | 11.6 | 10.7 | 12.6 | 12.2 |
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| Bolivia | 9.9 | 10.8 | 11.1 | 9.8 |
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| Uganda | 14.8 | 11.2 | 12.3 | 13.8 |
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| Belize | 12.8 | 11.3 | 9.6 | 9.8 |
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| Honduras | 10.0 | 11.4 | 11.4 | 11.4 |
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| Samoa | 8.3 | 11.5 | 9.1 | 11.3 |
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| Peru | 12.9 | 11.7 | 14.0 | 15.2 |
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| Sao Tome and Principe | 11.7 | 11.8 | 9.9 | 7.9 |
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| Croatia | 10.9 | 11.9 | 13.5 | 12.7 |
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| El Salvador | 11.0 | 12.0 | 13.2 | 10.5 |
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| Kazakhstan | 11.4 | 12.0 | 11.2 | 11.2 |
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| South Africa | 12.4 | 12.7 | 11.5 | 11.8 |
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| Egypt, Arab Rep. | 14.5 | 13.0 | 8.8 | 7.0 |
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| Aruba | 10.1 | 13.7 | 13.9 | 13.5 |
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| Ukraine | 12.2 | 14.3 | 17.3 | 17.9 |
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| Malawi | 12.7 | 14.4 | 15.1 | 16.2 |
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| Lesotho | 18.2 | 14.5 | 20.2 | 22.2 |
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| Bulgaria | 17.5 | 14.8 | 19.1 | 20.2 |
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| Tonga | 15.8 | 14.8 |
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| Nicaragua | 16.7 | 14.9 | 18.5 | 18.1 |
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| Tanzania | 13.9 | 14.9 | 12.9 | 13.5 |
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| Barbados | 24.4 | 15.1 | 25.9 |
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| West Bank and Gaza | 18.7 | 15.5 | 6.0 |
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| Kyrgyz Republic | 12.1 | 15.6 | 19.5 | 14.3 |
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| Uruguay | 18.8 | 15.7 | 15.4 | 11.9 |
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| Namibia | 3.9 | 16.8 | 32.8 | 27.0 |
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| Colombia | 16.8 | 17.3 | 17.0 | 13.9 |
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| Australia | 18.8 | 17.5 | 17.5 | 17.7 |
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| Korea, Rep. | 15.2 | 17.5 | 20.2 | 20.4 |
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| Guatemala | 19.6 | 17.5 | 18.9 | 21.1 |
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| Grenada | 15.8 | 17.5 | 17.2 | 16.4 |
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| Hong Kong SAR, China | 16.7 | 17.6 | 16.3 |
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| Chile | 19.0 | 17.9 | 18.6 | 19.8 |
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| St. Kitts and Nevis | 17.5 | 18.0 | 13.6 | 14.0 |
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| Malta | 18.1 | 18.1 | 13.8 | 13.1 |
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| Armenia | 19.4 | 18.1 | 18.0 | 13.3 |
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| Dominica | 23.1 | 18.4 | 16.6 | 16.6 |
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| French Polynesia | 17.5 | 18.8 | 10.7 | 9.7 |
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| New Zealand | 18.3 | 18.9 | 20.2 | 21.1 |
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| Kosovo | 16.7 | 18.9 | 22.9 | 27.1 |
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| Belarus | 15.9 | 19.0 | 17.7 | 16.9 |
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| Morocco | 18.2 | 19.1 | 20.1 | 20.1 |
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| Malaysia | 18.3 | 19.5 |
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| Latvia | 19.0 | 19.6 | 21.5 | 20.3 |
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| Portugal | 19.1 | 20.1 | 18.7 | 18.6 |
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| Luxembourg | 18.1 | 20.3 | 18.3 | 19.0 |
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| Cyprus | 20.1 | 20.4 | 24.8 | 25.0 |
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| Nepal | 18.2 | 20.9 | 29.7 | 40.5 |
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| United States | 19.8 | 21.0 | 20.8 | 20.3 |
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| Slovak Republic | 24.4 | 21.3 | 23.2 | 25.2 |
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| Oman | 29.8 | 21.3 | 24.7 | 15.0 |
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| Azerbaijan | 21.1 | 21.4 | 20.1 | 14.1 |
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| Brunei Darussalam | 21.2 | 21.4 |
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| Costa Rica | 19.5 | 22.0 | 28.2 | 32.4 |
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| Benin | 20.7 | 22.0 | 23.0 |
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| Burkina Faso | 21.0 | 22.2 | 21.1 |
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| Slovenia | 21.5 | 22.4 | 21.9 | 22.3 |
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| Moldova | 20.9 | 22.4 | 25.7 | 26.2 |
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| Niger | 19.7 | 23.1 | 5.4 |
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| Pakistan | 17.8 | 23.2 | 16.3 | 23.4 |
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| Cameroon | 37.2 | 24.0 | 30.2 |
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| Thailand | 18.9 | 24.2 | 20.5 | 17.1 |
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| Bahrain | 22.9 | 24.2 | 23.1 | 28.0 |
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| Macedonia, FYR | 24.7 | 25.0 | 29.3 | 22.7 |
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| Singapore | 23.7 | 25.3 | 23.2 | 22.9 |
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| Austria | 25.1 | 25.6 | 25.6 | 28.6 |
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| Hungary | 27.0 | 27.3 | 29.1 | 29.3 |
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| Seychelles | 20.6 | 27.4 | 23.5 | 24.0 |
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| Estonia | 26.1 | 27.4 | 24.8 | 24.1 |
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| St. Vincent and the Grenadines | 26.5 | 27.7 | 26.8 | 26.1 |
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| Indonesia | 22.5 | 27.8 | 32.9 | 34.3 |
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| Mozambique | 20.8 | 28.2 | 30.4 | 21.1 |
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| Botswana | 19.0 | 28.6 | 26.1 |
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| Sri Lanka | 26.6 | 28.7 | 24.0 | 22.9 |
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| Spain | 27.9 | 29.0 | 29.4 | 29.8 |
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| Mauritius | 21.5 | 29.2 | 31.9 | 31.5 |
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| Cote d'Ivoire | 30.9 | 29.7 | 28.5 |
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| Japan | 24.4 | 29.8 | 25.5 | 28.1 |
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| Russian Federation | 28.5 | 29.9 | 30.6 | 32.3 |
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| Italy | 31.8 | 30.5 | 33.7 | 34.0 |
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| France | 20.6 | 30.6 | 31.0 | 30.4 |
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| Togo | 31.4 | 30.7 | 23.2 |
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| Poland | 27.0 | 30.8 | 36.0 | 33.7 |
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| Switzerland | 25.1 | 30.9 | 32.7 | 32.7 |
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| Czech Republic | 31.3 | 31.2 | 31.5 | 35.0 |
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| Senegal | 31.5 | 31.2 | 33.6 |
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| Mali | 28.3 | 31.2 | 33.9 |
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| China | 28.3 | 31.8 | 31.3 | 32.8 |
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| Paraguay | 24.6 | 31.9 | 28.9 | 33.0 |
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| Germany | 31.8 | 32.1 | 32.2 | 32.5 |
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| Norway | 32.1 | 32.7 | 36.4 | 37.2 |
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| Guinea | 37.2 | 32.8 | 53.7 | 49.3 |
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| Bangladesh | 31.1 | 33.6 | 36.2 | 37.7 |
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| Tajikistan | 34.7 | 33.9 | 68.2 | 48.5 |
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| Afghanistan | 28.2 | 36.0 | 37.3 |
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| Guyana | 43.7 | 36.3 | 32.1 |
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| United Kingdom | 36.1 | 37.8 | 41.6 | 39.4 |
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| Romania | 32.7 | 38.2 | 35.1 | 35.0 |
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| Serbia | 35.9 | 39.0 | 40.4 | 38.5 |
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| Belgium | 35.5 | 41.6 | 41.8 | 42.0 |
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| Argentina | 38.3 | 42.6 | 42.1 | 45.4 |
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| Canada | 41.5 | 43.4 | 43.2 | 42.3 |
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| Algeria | 43.0 | 43.9 | 57.6 | 61.7 |
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| Bermuda | 43.2 | 44.9 | 42.0 | 40.9 |
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| Netherlands | 43.3 | 45.3 | 45.4 | 45.6 |
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| Finland | 48.2 | 47.8 | 43.5 | 40.4 |
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| Sierra Leone | 4.7 | 48.3 | 5.8 | 49.8 |
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| Swaziland | 49.7 | 49.1 | 29.0 |
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| Papua New Guinea | 74.0 | 49.6 | 49.3 |
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| Sweden | 52.4 | 50.3 | 51.9 | 51.9 |
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| Guinea-Bissau | 11.9 | 51.3 | 55.4 |
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| Brazil | 49.2 | 51.9 | 51.5 | 52.9 |
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| Lebanon | 61.7 | 55.4 | 26.5 | 47.8 |
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| Kuwait | 59.5 | 38.2 | 35.3 |
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| Israel | 53.8 | 60.3 | 56.0 | 57.4 |
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| Philippines | 50.7 | 61.5 | 63.5 | 65.4 |
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| Ireland | 61.2 | 64.3 | 64.9 | 62.1 |
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| India | 69.3 | 66.3 | 61.8 | 61.5 |
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| Suriname | 44.2 | |||||
| Mexico | ||||||
| Tuvalu | ||||||
| Mauritania | ||||||
| Timor-Leste | ||||||
| Puerto Rico | ||||||
| Burundi | 3.5 | |||||
| Qatar | ||||||
| Faeroe Islands | ||||||
| Marshall Islands | ||||||
| Cuba | ||||||
| Maldives | ||||||
| Chad | ||||||
| Madagascar | ||||||
| Guam | ||||||
| Liechtenstein | ||||||
| Gambia, The | ||||||
| San Marino | ||||||
| Equatorial Guinea | ||||||
| Libya | ||||||
| Denmark | ||||||
| Liberia | ||||||
| Turkmenistan | ||||||
| Lao PDR | ||||||
| Comoros | ||||||
| Monaco | ||||||
| Cayman Islands | ||||||
| Korea, Dem. Rep. | ||||||
| Micronesia, Fed. Sts. | ||||||
| Kiribati | ||||||
| Greenland | ||||||
| Kenya | ||||||
| Ghana | ||||||
| Sint Maarten (Dutch part) | ||||||
| Gabon | ||||||
| Jordan | ||||||
| Eritrea | ||||||
| Myanmar | ||||||
| Ecuador | ||||||
| Isle of Man | ||||||
| Djibouti | ||||||
| Somalia | ||||||
| Curacao | ||||||
| Northern Mariana Islands | ||||||
| Congo, Rep. | ||||||
| South Sudan | ||||||
| Turks and Caicos Islands | ||||||
| Iran, Islamic Rep. | ||||||
| Congo, Dem. Rep. | ||||||
| Vietnam | ||||||
| United Arab Emirates | ||||||
| Bahamas, The | ||||||
| Central African Republic | ||||||
| American Samoa | ||||||
| Uzbekistan | ||||||
| Palau | ||||||
| Bhutan | 3.9 | |||||
| Iceland | 27.1 | |||||
| Virgin Islands (U.S.) | ||||||
| Haiti | ||||||
| Andorra | ||||||
| St. Martin (French part) | ||||||
| Zimbabwe |