Region
United States
2,137
Russia (Federation)
75
China
73
Europe
39
European Union countries
39
Developing countries
25
Asia
22
California
22
Canada
22
Latin America
21
India
19
Mexico
18
Middle East
17
Asia, Central
15
Germany
15
West (U.S.)
15
East Asia
13
Great Britain
13
Japan
13
Iraq
11
Ukraine
10
Australia
9
Baltic Sea
9
Europe, Eastern
9
Iran
8
North America
8
Pacific Area
8
Southeast Asia
8
Brazil
7
West Virginia
7
Alaska
6
Belarus
6
Caspian Sea Region
6
Czech Republic
6
Former Soviet republics
6
South Asia
6
Soviet Union
6
Turkey
6
Azerbaijan
5
Europe, Western
5
Mediterranean Region
5
Western Hemisphere
5
Africa
4
Africa, West
4
Arab countries
4
Colombia
4
Eurasia
4
Lithuania
4
Netherlands
4
Northeastern States
4
more ...