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Subject (Region)
- United States41,330
- Great Britain5,983
- France4,500
- Germany1,816
- China1,534
- Japan1,511
- New York (State)1,391
- Italy1,387
- Canada1,331
- Developing countries1,268
- Massachusetts992
- Mexico954
- California943
- England916
- Spain881
- Europe865
- India841
- Indonesia733
- Pennsylvania732
- Illinois704