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Subject (Region)
- Belgium[remove]50
- Canada[remove]50
- Australia49
- France35
- Great Britain35
- Norway32
- Germany (to 1949; 1990- )30
- Italy29
- Netherlands24
- China22
- Japan22
- Poland20
- India17
- Mexico17
- New Zealand17
- Spain17
- Russia (to 1921)16
- Switzerland16
- Argentina15
- Denmark15