Region
United States --
12
Developing countries --
9
United States
6
Japan --
5
Malaysia
5
Developing countries
4
Europe --
4
European Economic Community countries --
4
China
2
China --
2
East Asia
2
Japan
2
Malaysia --
2
21st century
1
Africa
1
Africa --
1
Asia
1
Asia --
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
Iraq --
1
Japan - --
1
Korea --
1
Malaya --
1
OECD countries --
1
Soviet Union
1
United Kingdom
1
United States - --
1
United states --
1