Region
European Economic Community countries --
Europe --
8
United States --
5
European Economic Community countries
4
Japan --
3
United States
3
Asia, Southeastern --
1
Europe, Eastern
1
Europe, Eastern --
1
European Economic
1
Hong Kong (China) --
1
Japan
1
Japan - --
1
Korea (South) --
1
Taiwan --
1
United States - --
1