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- United States18,191
- Great Britain2,288
- China2,154
- France1,920
- Germany1,768
- Developing countries1,475
- Japan1,369
- India1,368
- Europe1,307
- Italy1,281
- Mexico997
- Indonesia973
- Canada832
- Soviet Union759
- Africa721
- Spain703
- Latin America685
- California650
- European Union countries648
- Russia (Federation)637