Region
United States
555
China
118
Japan
37
Developing countries
34
Soviet Union
19
Europe, Eastern
15
India
10
Asia
8
Europe
8
Germany
8
Great Britain
8
Russia (Federation)
7
Africa
6
Latin America
6
East Asia
5
Mexico
5
Pacific Area
5
Europe, Central
3
Former Soviet republics
3
Korea (South)
3
New Mexico
3
Russia
3
Canada
2
Colombia
2
Europe, Northern
2
European Union countries
2
Iraq
2
Liberia
2
Mediterranean Region
2
New Hampshire
2
North America
2
Pakistan
2
Singapore
2
South China Sea
2
Southern States
2
Taiwan
2
Zimbabwe
2
Africa, North
1
Albuquerque
1
Arab countries
1
Asie
1
Azerbaijan
1
Brazil
1
British Columbia
1
Caribbean Area
1
Communist countries
1
Eurasia
1
European Economic Community countries
1
Great Plains
1
Hong Kong
1
more ...