Region
United States --
9
United States
6
China
4
China --
4
Asia --
2
Europe --
2
Pacific Area
2
Pacific Area --
2
Soviet Union
2
Soviet Union --
2
Asia
1
European Union countries
1
European Union countries --
1
Japan --
1
Pacific area
1
Pacific area --
1
South Asia
1
South Asia --
1
Southeast Asia --
1
United State --
1
United States --
1