Table 3.
The distribution of the bibliographic records by top 10 (by quantity) countries.
| Country | Rank based on total output | Output (N=1198), n (%) | Citations (N=18,876),n (%) | Rank based on citations | Citation per document | GDPa rank |
| United States | 1 | 488 (40.7) | 8678 (46) | 1 | 17.78 | 1 |
| China | 2 | 173 (14.4) | 1294 (6.9) | 3 | 7.48 | 2 |
| United Kingdom | 3 | 116 (9.7) | 2765 (14.7) | 2 | 23.84 | 6 |
| Germany | 4 | 62 (5.2) | 873 (4.6) | 5 | 14.08 | 4 |
| Canada | 5 | 60 (5) | 740 (3.9) | 6 | 12.33 | 8 |
| Italy | 6 | 58 (4.8) | 386 (2) | 12 | 6.66 | 9 |
| France | 7 | 52 (4.3) | 905 (4.8) | 4 | 17.40 | 7 |
| Spain | 8 | 47 (3.9) | 351 (1.9) | 13 | 7.47 | 15 |
| South Korea | 9 | 46 (3.8) | 442 (2.3) | 10 | 9.61 | 12 |
| Australia | 10 | 41 (3.4) | 520 (2.8) | 8 | 12.68 | 13 |
| India | 11 | 39 (3.3) | 495 (2.6) | 9 | 12.69 | 5 |
| Netherlands | 12 | 39 (3.3) | 534 (2.8) | 7 | 13.69 | 19 |
| Taiwan | 13 | 35 (2.9) | 319 (1.7) | 14 | 9.11 | 21 |
| Iran | 14 | 29 (2.4) | 171 (0.9) | 15 | 5.90 | 14 |
| Belgium | 15 | 24 (2) | 403 (2.1) | 11 | 16.79 | 25 |
aGDP: gross domestic product.