Region
United States
4
United States --
4
Malaysia
3
Malaysia --
2
Philippines
2
Philippines --
2
Soviet Union --
2
Africa --
1
Arab countries --
1
Argentina
1
Argentina --
1
Asia, Southeastern
1
Asia, Southeastern --
1
China --
1
Europe --
1
Europe, Eastern --
1
Germany --
1
Indonesia
1
Romania
1
Singapore
1
Soviet Union
1