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Subject (Region)
- United States32,376
- Great Britain3,183
- France1,822
- Germany1,114
- New York (State)925
- Developing countries868
- China832
- Japan816
- California767
- Italy753
- Canada661
- Europe589
- England506
- India498
- Illinois489
- Mexico486
- Massachusetts432
- Indonesia389
- New York370
- Spain370