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- United States17,563
- Great Britain5,783
- China4,443
- Europe2,661
- France2,637
- Germany2,527
- India2,343
- Africa2,290
- Mexico2,245
- Latin America2,235
- Japan2,111
- Indonesia1,983
- Developing countries1,972
- Italy1,932
- Brazil1,770
- Soviet Union1,742
- Spain1,741
- Canada1,552
- Russia (Federation)1,551
- Asia1,274