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Country productivity (N=315).
| Rank | Country | Output, n (%) |
| 1 | United States of America | 94 (29.8) |
| 2 | United Kingdom | 28 (8.9) |
| 3 | Spain | 24 (7.6) |
| 4 | Canada | 21 (6.7) |
| 5 | People’s Republic of China | 18 (5.7) |
| 6 | Australia | 16 (5.1) |
| 6 | Italy | 16 (5.1) |
| 7 | South Korea | 15 (4.8) |
| 8 | Germany | 13 (4.1) |
| 8 | Taiwan | 13 (4.1) |
| 9 | Netherlands | 12 (3.8) |
| 10 | France | 8 (2.5) |
| 11 | Brazil | 6 (1.9) |
| 12 | Finland | 5 (1.6) |
| 12 | Israel | 5 (1.6) |
| 12 | Turkey | 5 (1.6) |
| 13 | Norway | 4 (1.3) |
| 13 | Poland | 4 (1.3) |
| 13 | Portugal | 4 (1.3) |
| 23 | Sweden | 4 (1.3) |
