| 1. |  United States (Contiguous) | 19,999 |
| 2. |  France | 19,124 |
| 3. |  Italy | 18,072 |
| 4. |  Germany | 17,108 |
| 5. |  England | 16,843 |
| 6. |  Spain | 15,906 |
| 7. |  Netherlands | 13,446 |
| 8. |  Austria | 12,209 |
| 9. |  Belgium | 10,475 |
| 10. |  Czech Republic | 10,364 |
| 11. |  Switzerland | 10,308 |
| 12. |  Canada | 10,190 |
| 13. |  Portugal | 8,978 |
| 14. |  Hungary | 8,302 |
| 15. |  Poland | 7,687 |
| 16. |  Mexico | 7,553 |
| 17. |  Greece | 7,401 |
| 18. |  Vatican City | 7,077 |
| 19. |  Denmark | 7,046 |
| 20. |  Turkey in Europe (Istanbul) | 7,028 |
| 21. |  Argentine Antarctica (Antarctic Peninsula) | 7,007 |
| 22. | British Antarctic Territory (Antarctic Peninsula, Graham Land, South Orkney, South Shetland) | 7,007 |
| 23. |  Sweden | 7,001 |
| 24. | Scotland | 6,688 |
| 25. |  Croatia | 6,673 |