Region
United States --
8
Developing countries --
7
Developing countries
4
European Economic Community countries --
4
Japan --
4
Europe --
3
Malaysia
3
East Asia
2
United States
2
21st century
1
Asia, Southeastern
1
Asia, Southeastern --
1
Britain
1
East Asia --
1
Eastern Europe --
1
Europe
1
Former Soviet republics --
1
Great Britain
1
Great Britain --
1
India --
1
Japan
1
Japan - --
1
Soviet Union
1
United States - --
1
United states --
1