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Subject (Region)
- United States3,257
- Mexico238
- China199
- Great Britain198
- Canada190
- Europe184
- Japan155
- Developing countries135
- France116
- Brazil111
- Outer space110
- Latin America104
- Colombia103
- European Union countries101
- India101
- Italy99
- Russia (Federation)97
- Argentina86
- Chile86
- Africa85