Region
United States
370
Great Britain
69
Developing countries
54
China
43
Europe
24
Asia
22
Soviet Union
21
India
20
Japan
19
France
17
Germany
13
Latin America
11
Africa, Sub-Saharan
10
Eastern Europe
10
Europe, Eastern
10
Sub-Saharan Africa
10
Massachusetts
8
Africa
7
England
7
Africa, West
6
Italy
6
Mexico
6
New England
6
Sweden
6
West Africa
6
Canada
5
Korea (South)
5
Southern States
5
Communist countries
4
East Asia
4
Islamic countries
4
Mediterranean Region
4
New York
4
New York (State)
4
Pakistan
4
Portugal
4
Scotland
4
Taiwan
4
America
3
Boston
3
California
3
Costa Rica
3
Former Soviet republics
3
Hawaii
3
Ireland
3
Israel
3
Kenya
3
Middle East
3
Middle East Region
3
New York (N.Y.)
3
more ...