Region
United States
15
Developing countries
9
Great Britain
7
North America
6
Europe
5
Asia
2
Japan
2
Mexico
2
America
1
Australia
1
China
1
East Indies
1
Europe, Eastern
1
European Free Trade Association countries
1
European Union Countries
1
European Union countries
1
European countries
1
European economic community countries
1
Indonesia
1
Latin America
1
Mediterranean Region
1
Pacific Area
1
Pakistan
1
South America
1
Sri Lanka
1