Region
Developing countries
31
Developing countries --
27
Soviet Union --
2
United States
2
United States --
2
Africa
1
Australia
1
Australia --
1
China
1
China --
1
Europe
1
Europe --
1
Great Britain
1
Indonesia --
1
Newly independent states --
1
Soviet Union
1
States, New --
1
US --
1
developing countries
1