Region
Developing countries
27
Developing countries --
18
United States
18
United States --
18
Soviet Union
11
Soviet Union --
10
China
3
Afghanistan
2
Afghanistan --
2
China --
2
United states --
2
Developed countries
1
Developed countries --
1
Europe
1
Europe --
1
Europe, Eastern
1
Europe, Eastern --
1
Islamic countries --
1
Middle East
1
Middle East --
1
Russia (Federation)
1
Russia (Federation) --
1