| 1999-2000 | 2009-2010 | |||||||
|---|---|---|---|---|---|---|---|---|
| Country/Territory | # Papers | % of 80 | Rank | Country/Territory | # Papers | % of 473 | Rank | IF (average) |
| World | 80 | 100.0 | World | 473 | 100.0 | 1.868 | ||
| European Union | 31 | 38.7 | European Union | 142 | 30.0 | 2.048 | ||
| USA | 26 | 32.5 | 1 | USA | 104 | 22.0 | 1 | 2.252 |
| United kingdom | 10 | 12.5 | 2 | China | 89 | 18.8 | 2 | 1.729 |
| Turkey | 6 | 7.5 | 3 | Brazil | 58 | 12.3 | 3 | 1.764 |
| Switzerland | 6 | 7.5 | 3 | Japan | 50 | 10.6 | 4 | 1.504 |
| Netherland | 6 | 7.5 | 3 | Germany | 33 | 7.0 | 5 | 2.134 |
| China (Taiwan) | 5 | 6.3 | 6 | Italy | 25 | 5.3 | 6 | 2.005 |
| Germany | 5 | 6.3 | 6 | Australia | 21 | 4.4 | 7 | 2.434 |
| Japan | 5 | 6.3 | 6 | Turkey | 21 | 4.4 | 7 | 1.452 |
| Canada | 3 | 3.8 | 9 | United Kingdom | 20 | 4.2 | 9 | 2.385 |
| Belgium | 3 | 3.8 | 9 | South Korea | 16 | 3.4 | 10 | 1.826 |
| France | 2 | 2.5 | 11 | Spain | 13 | 2.7 | 11 | 2.051 |
| Italy | 2 | 2.5 | 11 | Switzerland | 13 | 2.7 | 11 | 2.847 |
| Iran | 1 | 1.3 | 13 | Belgium | 12 | 2.5 | 13 | 2.736 |
| Poland | 1 | 1.3 | 13 | France | 12 | 2.5 | 13 | 1.689 |
| Thailand | 1 | 1.3 | 13 | Canada | 10 | 2.1 | 15 | 1.339 |
| Denmark | 1 | 1.3 | 13 | India | 10 | 2.1 | 15 | 1.228 |
| Czech Rep | 1 | 1.3 | 13 | Netherland | 9 | 1.9 | 17 | 1.789 |
| Australia | 1 | 1.3 | 13 | Iran | 8 | 1.7 | 18 | 1.483 |
| New Zealand | 1 | 1.3 | 13 | Greece | 6 | 1.3 | 19 | 1.746 |
| Sweden | 1 | 1.3 | 13 | New Zealand | 6 | 1.3 | 19 | 1.859 |
| Brazil | 1 | 1.3 | 13 | Singapore | 6 | 1.3 | 19 | 1.651 |
| Hungary | 1 | 1.3 | 13 | Egypt | 5 | 1.1 | 22 | 1.556 |
| South Korea | 1 | 1.3 | 13 | Saudi Arabia | 5 | 1.1 | 22 | 1.607 |
| Greece | 1 | 1.3 | 13 | Serbia | 5 | 1.1 | 22 | 1.020 |