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Subject (Region)
- Great Britain944
- United States831
- Soviet Union221
- Europe216
- France163
- Germany161
- China133
- Africa81
- India75
- Tanzania68
- Europe, Eastern67
- Canada66
- Cuba58
- Developing countries57
- England52
- Russia51
- Germany (East)48
- Italy43
- Latin America42
- Korea (North)40