Region
Developing countries --
5
European Economic Community countries --
4
United States --
4
Japan --
3
Malaysia
3
Malaysia --
3
Asia --
2
Africa
1
Africa --
1
Asia
1
Canada --
1
China
1
China --
1
East Asia --
1
Eastern Europe --
1
Europe --
1
Germany (West) --
1
Germany --
1
Group of Twenty countries --
1
United States
1