Region
United States
United States --
22
United states --
6
Soviet Union
5
Soviet Union --
4
Europe
3
Asia
2
Developing countries
2
Developing countries --
2
East Asia
2
Europe --
2
India
2
India --
2
Afghanistan
1
Afghanistan --
1
Africa, Northeast
1
Africa, Northeast --
1
China
1
China --
1
East Asia --
1
Egypt
1
Egypt --
1
Great Britain
1
Great Britain --
1
Indonesia
1
Indonesia --
1
Japan
1
Middle East
1
Middle East --
1
Pacific --
1
Pacific area
1
Pakistan
1
Pakistan --
1
Taiwan
1
Taiwan --
1
Turkey
1
Turkey --
1
United States. Congress. Senate - --
1