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- United States33,093
- Great Britain8,141
- Europe4,866
- European Union countries3,100
- India3,061
- China2,617
- Canada2,518
- Africa2,100
- Soviet Union1,621
- Nigeria1,516
- France1,419
- South Africa1,379
- Australia1,360
- Latin America1,333
- Germany1,316
- Developing countries1,225
- Asia1,145
- Japan1,101
- Russia (Federation)983
- Philippines947