Region
United States --
74
United States
46
China --
18
Soviet Union --
16
Soviet Union
14
China
9
Asia
7
Asia --
7
Great Britain --
6
Europe --
5
Latin America --
5
Malaysia
5
Malaysia --
5
Cuba --
4
Europe
4
Middle East
4
Middle East --
4
Africa --
3
Australia --
3
Developing countries --
3
Great Britain
3
Israel
3
Israel --
3
Japan --
3
Latin America
3
Singapore
3
Singapore --
3
United states --
3
Argentina --
2
Australia
2
Brazil --
2
Canada --
2
Caribbean Area
2
Caribbean Area --
2
Central America
2
Central America --
2
Cuba
2
Europe, Eastern
2
Europe, Eastern --
2
Islamic countries
2
Islamic countries --
2
Japan
2
Pacific Area --
2
Pacific area --
2
Sweden
2
Sweden --
2
Africa
1
Africa, Southern
1
Africa, Southern --
1
Argentina
1
more ...