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- United States15,512
- Great Britain5,572
- China3,425
- India2,789
- Europe2,293
- Africa2,110
- Developing countries2,001
- Canada1,644
- Japan1,623
- South Africa1,519
- Latin America1,388
- Soviet Union1,296
- Asia1,256
- Philippines1,150
- England1,144
- Ireland1,135
- Europe, Eastern1,001
- Mexico976
- Nigeria969
- Germany909