Region
Africa
3
Arab countries
1
Asia
1
Canada
2
China
4
Czechoslovakia
1
Developing countries
2
Europe
10
Europe, Central
1
Europe, Eastern
3
European Union countries
15
Finland
1
France
1
Germany
2
Germany (West)
1
Great Britain
2
Israel
2
Japan
1
Korea
1
Korea (North)
1
Korea (South)
1
Latin America
1
Mediterranean Region
1
Middle East
1
Poland
1
Russia (Federation)
3
Southeast Asia
1
Soviet Union
3
Switzerland
1
Turkey
2
Ukraine
1
United States
21