Region
Asia
4
United States --
4
United States
3
East Asia
2
Soviet Union
2
ASEAN
1
ASEAN --
1
Asia Pacific
1
Asia, Southeastern
1
Asia, Southeastern --
1
Central Europe
1
Developing countries
1
Europe
1
Europe --
1
Europe, Eastern
1
Japan
1
Middle East
1
Pacific Area
1
Papua New Guinea --
1
Philippines
1
Soviet --
1
Soviet Union --
1