Region
United States
United States --
16
Arab countries
1
Arab countries --
1
Argentina
1
Argentina --
1
Asia
1
Asia --
1
China
1
China --
1
Developing countries
1
Developing countries --
1
Europe
1
Europe --
1
Germany (West)
1
Germany (West) --
1
India
1
India --
1
Japan
1
Japan --
1
Malaysia
1
Malaysia --
1
Pakistan --
1
Soviet Union
1
Soviet Union --
1
Ukraine
1
Ukraine --
1