Region
Argentina
1
Asia
1
Berlin
1
Brazil
2
China
10
Communist countries
6
Developing countries
3
Europe
7
Europe, Eastern
4
Germany
1
Grande-Bretagne
1
Great Britain
2
Indonesia
1
Japan
2
Latin America
2
Malaysia
1
Manufacturing industries
1
Mexico
1
Peru
1
Scandinavia
1
Southern States
2
Soviet Union
2
United States
18
États-Unis
1