Based on data for the year 2009, the top twenty-five, in order, are:

1. China
2. United States
3. India
4. Russia
5. Japan
6. Germany
7. Canada
8. South Korea
9. Iran
10. United Kingdom
11. Saudi Arabia
12. South Africa
13. Mexico
14. Brazil
15. Australia
16. Indonesia
17. Italy
18. France
19. Spain
20. Taiwan
21. Poland
22. Ukraine
23. Thailand
24. Turkey
25. Netherlands