Region
United States --
14
United States
8
China --
7
China
6
Developing countries --
3
Great Britain --
3
Soviet Union
3
Soviet Union --
3
France --
2
Africa
1
Africa --
1
Asia --
1
Asia, Southeastern
1
Asia, Southeastern --
1
Developing countries
1
Europe, Eastern
1
Europe, Eastern --
1
France
1
Germany (West)
1
Germany (West) --
1
Great Britain
1
India
1
India --
1
Japan
1
Japan --
1
Mediterranean Region --
1
Pakistan
1
Pakistan --
1
United State --
1
Yugoslavia
1
Yugoslavia --
1