Region
United States --
20
United States
10
Great Britain --
5
Soviet Union --
5
Japan --
4
Great Britain
3
Soviet Union
3
United states --
3
China --
2
Europe --
2
Asia --
1
Canada
1
China
1
Eurasia --
1
Europe
1
Germany --
1
India
1
India --
1
Japan
1
Pacific area --
1
Russia
1
Russia (Federation)
1
Russia (Federation) --
1
Russia --
1
Southern States
1
Southern States --
1
Spain --
1
Taiwan
1
Taiwan --
1
Yugoslavia --
1