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Subject (Region)
- United States1,402
- China333
- Europe214
- Soviet Union181
- Russia (Federation)174
- Japan158
- Great Britain150
- Germany131
- European Union countries122
- Middle East106
- France104
- Asia78
- Developing countries65
- Latin America63
- Poland63
- Africa61
- India55
- Russia51
- Canada50
- Turkey50