Subject Region
United States
172
Japan
98
China
44
Great Britain
43
India
25
Germany
23
Soviet Union
21
Europe
20
Mexico
15
Colombia
14
Asia
13
Developing countries
13
Spain
10
Brazil
9
Latin America
8
Indonesia
7
Italy
7
Africa
6
Europe, Eastern
6
Hong Kong
6
European Union countries
5
Venezuela
5
Argentina
4
Espana
4
Europe, Central
4
Russia (Federation)
4
Singapore
4
Cuba
3
England
3
Germany (West)
3
Massachusetts
3
Minnesota
3
North America
3
Romania
3
Taiwan
3
Thailand
3
Australia
2
Baltic States
2
Canada
2
Canada, Northern
2
East Asia
2
Ecuador
2
Europa
2
France
2
Hong Kong (China)
2
Ireland
2
Korea (South)
2
Kyoto
2
Norway
2
OECD countries
2
more ...