Region
United States --
6
United States
5
China
3
China --
3
Developing countries
2
Soviet Union
2
Soviet Union --
2
ASEAN countries
1
ASEAN countries --
1
Africa, Southern --
1
Central America
1
Central America --
1
Europe
1
Europe --
1
Germany
1
Germany (West)
1
Germany (West) --
1
Germany --
1
Great Britain
1
Great Britain --
1
Hong Kong (China) --
1
Indonesia
1
Indonesia --
1
Iran --
1
Japan --
1
Saudi Arabia --
1
Singapore --
1
Switzerland
1
Switzerland --
1
Taiwan
1
Taiwan --
1
Western countries
1
Western countries --
1