Region
United States --
United States
44
Soviet Union --
5
Soviet Union
4
Asia
3
Asia --
3
Developing countries
2
Developing countries --
2
Europe --
2
Japan --
2
Asia, Southeastern --
1
Bulgaria
1
Bulgaria --
1
Central America
1
Central America --
1
Chile
1
Chile --
1
China
1
China --
1
Cuba
1
Cuba --
1
Europe
1
European Economic Community countries --
1
Great Britain
1
Great Britain --
1
India
1
India --
1
Iran
1
Iran --
1
Japan
1
Korea
1
Korea --
1
Latin America
1
Latin America --
1
Malaysia
1
Mexico
1
Mexico --
1
Vietnam
1
Vietnam --
1
central America
1