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Subject (Region)
- United States[remove]3,977
- Great Britain80
- Europe41
- Middle East33
- Germany32
- France28
- California25
- Canada25
- China25
- Japan21
- Russia (Federation)20
- Vietnam20
- Soviet Union18
- Iraq14
- Arab countries12
- Israel12
- Developing countries11
- Mexico11
- Singapore11
- South Africa11