Region
United States
4
United States --
4
Great Britain
3
Great Britain --
3
India
2
India --
2
South Africa
2
South Africa --
2
Soviet Union
2
Soviet Union --
2
Africa --
1
Africa, Sub-Saharan
1
Africa, Sub-Saharan --
1
France
1
France --
1
Indonesia
1
Indonesia --
1
Philippines
1
Philippines --
1
Russia (Federation)
1
Russia --
1
Sweden
1
Sweden --
1