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Subject (Region)
- United States6,950
- Europe697
- Developing countries640
- European Union countries493
- Mexico426
- China411
- Canada332
- Latin America332
- Africa313
- Japan304
- Great Britain303
- France248
- Russia (Federation)244
- Soviet Union220
- Germany203
- India187
- Outer space186
- Italy179
- Asia170
- Brazil169