Region
United States
19
Soviet Union
5
Great Britain
4
Europe
3
Germany
3
Africa
2
Eastern Europe
2
Europe, Eastern
2
Japan
2
Africa, Sub-Saharan
1
Arab countries
1
Byzantine Empire
1
China
1
Communist countries
1
East Asia
1
England
1
European Economic Community countries
1
Gaza Strip
1
India
1
Israel
1
Italy
1
Libya
1
London
1
Panama
1
Panama Canal (Panama)
1
Portugal
1
South Africa
1
Southeast Asia
1
Sub-Saharan Africa
1
West Bank
1