Subject Region
United States
181
China
65
Europe
41
Great Britain
36
India
36
Latin America
33
Russia (Federation)
25
Europe, Eastern
20
Japan
19
Mexico
19
Africa
18
France
15
South Africa
15
England
14
Soviet Union
14
California
13
Developing countries
13
Brazil
12
Cuba
12
Germany
11
Southern States
11
Australia
10
Canada
10
Greece
10
Iran
10
New York (State)
10
Poland
10
Arab countries
9
Shanghai
9
Turkey
9
Ireland
8
Massachusetts
8
Mediterranean Region
8
Nigeria
8
North Carolina
8
Québec (Province)
8
Russia
8
Europe, Central
7
Hong Kong
7
Hong Kong (China)
7
Indonesia
7
Italy
7
Shanghai (China)
7
Argentina
6
Asia
6
Kenya
6
Lagos
6
Lagos (Nigeria)
6
New Jersey
6
New York
6
more ...