Region
Europe
United States
United States --
33
Europe --
32
Canada
3
Soviet Union
3
Asia
2
Developing countries
2
Developing countries --
2
Islamic countries
2
Islamic countries --
2
Japan
2
Lebanon --
2
Middle East
2
Middle East --
2
Soviet Union --
2
Asia --
1
Canada --
1
Egypt
1
Egypt --
1
Israel
1
Israel --
1
Japan --
1
Russia
1
Russia (Federation)
1
Russia (Federation) --
1
Russia --
1