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- United States17,960
- Great Britain2,296
- China2,050
- France1,944
- Germany1,788
- Developing countries1,443
- Japan1,324
- India1,300
- Europe1,270
- Italy1,266
- Indonesia1,052
- Mexico962
- Soviet Union756
- Canada740
- Spain697
- Africa664
- Latin America655
- European Union countries633
- California621
- Russia (Federation)614