Region
United States
33
United States --
Afghanistan
2
Afghanistan --
2
Developing countries
2
Developing countries --
2
Soviet Union
2
Soviet Union --
2
Central America
1
Central America --
1
China
1
Europe
1
Europe --
1
Haiti
1
Haiti --
1
Iran
1
Iran --
1
Southern States
1
Southern States --
1
Western countries
1