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Subject (Region)
- United States3,594
- Europe1,135
- Soviet Union944
- Japan508
- Great Britain506
- China469
- Germany464
- France358
- Developing countries311
- Russia (Federation)296
- Italy291
- Middle East251
- Arab countries196
- Asia181
- Latin America168
- Germany (West)155
- Islamic countries155
- Africa140
- India117
- Poland92