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Subject (Region)
- United States46,900
- Developing countries4,760
- India4,659
- Europe4,613
- Great Britain4,519
- Mexico4,441
- Canada4,165
- China3,880
- Latin America3,274
- Brazil3,249
- California2,950
- Africa2,777
- Japan2,674
- European Union countries2,597
- Australia2,559
- North America2,487
- Argentina2,234
- Peru2,122
- Tanzania2,030
- Asia1,922