Region
Europe
Europe --
United States --
12
United States
11
North America --
2
Russia (Federation)
2
Russia (Federation) --
2
Canada
1
Developing countries
1
Developing countries --
1
East Asia --
1
European Union Countries --
1
Japan
1
Japan --
1
Kosovo (Serbia)
1
Kosovo (Serbia) --
1
North America
1
North Atlantic Treaty Organization --
1
Russia
1
Russia --
1
Serbia and Montenegro --
1
Soviet Union
1
Soviet Union --
1