Region
United States
32
Haiti
7
Europe
5
Mexico
5
China
4
Europe, Eastern
3
Africa
2
India
2
Iran
2
South Africa
2
Asia
1
Balkan Peninsula
1
Bosnia and Herzegovina
1
Botswana
1
Colombia
1
Congo (Democratic Republic)
1
El Salvador
1
Former Soviet republics
1
Guatemala
1
Middle East
1
Namibia
1
Nicaragua
1
Romania
1
Soviet Union
1