Region
United States
22
China
13
Developing countries
12
Japan
10
Great Britain
7
Asia
5
Europe
4
Africa, Sub-Saharan
3
East Asia
3
Eastern Europe
3
Europe, Eastern
3
Latin America
3
Pacific Area
3
Sub-Saharan Africa
3
Brazil
2
European Union countries
2
Southeast Asia
2
Soviet Union
2
Africa
1
Australia
1
California
1
Canada
1
Caribbean Area
1
Chile
1
Commonwealth countries
1
Germany
1
Ghana
1
Group of Twenty countries
1
India
1
Los Angeles
1
Los Angeles (Calif.)
1
North America
1
Pakistan
1
Philippines
1
South Africa
1
Tanzania
1
West Indies, British
1