Region
United States
131
Great Britain
24
Canada
19
China
14
Developing countries
8
Australia
7
Europe
6
India
6
Asia
5
European Union countries
5
Germany
5
Japan
5
Soviet Union
5
Latin America
4
Russia (Federation)
4
Africa
3
East Asia
3
Pacific Area
3
Singapore
3
South Africa
3
South Asia
3
Ukraine
3
Arab countries
2
Bulgaria
2
Denmark
2
France
2
Iran
2
Israel
2
Mexico
2
Middle East
2
Netherlands
2
North America
2
Poland
2
Spain
2
Taiwan
2
Washington (D.C.)
2
Africa, East
1
Africa, Sub-Saharan
1
America
1
Argentina
1
Austria
1
Belgium
1
Brazil
1
Caribbean Area
1
Central America
1
Chicago
1
Czech Republic
1
Developed countries
1
Egypt
1
England
1
more ...