Region
Soviet Union
4
China --
3
Asia, Southeastern --
2
Developing countries --
2
Middle East --
2
Soviet Union --
2
Africa, North
1
Asia
1
Asia --
1
Asia, Southeastern
1
China
1
Egypt --
1
Indian Ocean --
1
Iraq --
1
Israel --
1
Latin America
1
Latin America --
1
Malaysia
1
Near East --
1
Russia
1
Russia --
1
Scandinavia --
1
Sudan --
1
Syria --
1
United States
1
United States --
1