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| Rank | Country | Citation count |
|---|---|---|
| 1. | England | 932 |
| 2. | Australia | 416 |
| 3. | United States | 358 |
| 4. | Canada | 272 |
| 5. | Netherlands | 157 |
| 6. | Scotland | 142 |
| 7. | China Mainland | 129 |
| 8. | Italy | 126 |
| 9. | Germany (Fed Rep Ger) | 122 |
| 10. | New Zealand | 117 |
| 11. | Denmark | 86 |
| 12. | Switzerland | 86 |
| 13. | India | 71 |
| 14. | Ireland | 68 |
| 15. | Spain | 65 |
| 16. | Brazil | 62 |
