Region
Africa
2
Argentina
3
Asia
3
Australia
1
Canada
2
China
13
Communist countries
2
Developing countries
1
East Asia
3
Europe
5
European Economic Community countries
1
Germany
6
Germany (West)
3
Great Britain
8
Hungary
1
Italy
1
Japan
13
Korea
2
Korea (North)
1
Korea (South)
5
Macau (China : Special Administrative Region)
1
Macau (Special Administrative Region)
1
Netherlands
1
Pakistan
2
Poland
2
Québec (Province)
1
Russia
1
Scandinavia
1
Southeast Asia
2
Soviet Union
5
Spain
3
Sweden
1
United States
52
Yugoslavia
1