Region
United States --
16
United States
9
United states --
4
Soviet Union --
3
Japan
2
Japan --
2
Africa, Southern --
1
Caribbean Area --
1
Foreign countries
1
Germany
1
Germany --
1
Russia
1
Russia (Federation)
1
Russia (Federation) --
1
Russia --
1
Soviet Union
1
United States - --
1
Yugoslavia
1
Yugoslavia --
1