Region
United States --
United States
7
China --
2
Soviet Union --
2
Asia
1
Asia --
1
Caribbean Area
1
Caribbean Area --
1
China
1
Developing countries --
1
Europe --
1
Germany --
1
Great Britain --
1
Indonesia
1
Indonesia --
1
Korea
1
Korea --
1
Russia (Federation)
1
Russia (Federation) --
1
Russia --
1
Soviet Union
1