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Subject (Region)
- United States46,153
- Developing countries4,664
- India4,606
- Great Britain4,427
- Europe4,156
- Canada4,084
- China3,581
- California2,926
- European Union countries2,541
- Australia2,531
- Japan2,444
- North America2,443
- Africa2,404
- Latin America2,216
- Mexico2,099
- Tanzania1,987
- Asia1,871
- Alaska1,760
- New York (State)1,559
- South Africa1,541