Region
United States
131
Developing countries
31
Europe
19
Canada
16
China
13
East Asia
13
Asia
9
Europe, Eastern
9
Africa
7
Africa, Sub-Saharan
6
Pacific Area
6
Arctic regions
5
Balkan Peninsula
5
Germany
5
Southern States
5
Australia
4
Great Britain
4
Greece
4
India
4
Latin America
4
Mediterranean Region
4
Middle East
4
Rome
4
Singapore
4
South Asia
4
America
3
England
3
Mississippi
3
North America
3
Portugal
3
Southeast Asia
3
Baltic Sea Region
2
Byzantine Empire
2
Caribbean Area
2
Europe, Central
2
Europe, Southern
2
European Union countries
2
Former Soviet republics
2
Himalaya Mountains Region
2
Iran
2
Islamic countries
2
Italy
2
Japan
2
Mexico
2
Netherlands
2
Outer space
2
Pacific Ocean
2
Russia (Federation)
2
South America
2
Soviet Union
2
more ...