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Subject (Region)
- United States6,967
- Europe703
- Developing countries638
- European Union countries494
- Mexico427
- China414
- Latin America335
- Canada333
- Africa315
- Great Britain304
- Japan304
- France248
- Russia (Federation)244
- Soviet Union220
- Germany203
- India187
- Outer space186
- Italy179
- Asia171
- Brazil170