Region
United States
42
United States --
33
Europe
5
China
3
China --
3
Europe --
3
Japan
3
Japan --
3
Asia
2
Pacific Area
2
Persian Gulf States
2
Taiwan
2
Taiwan --
2
United states --
2
Asia --
1
Central America
1
Central America --
1
Developing countries
1
East Asia
1
East Asia --
1
Europe, Eastern
1
Europe, Eastern --
1
European Union Countries --
1
European Union Countrirs
1
Pacific
1
Pacific --
1
Pacific area
1
Persian Gulf States --
1
Russia (Federation)
1
Russia (Federation) --
1
Saudi Arabia
1
Saudi Arabia --
1
Soviet Union
1
Soviet Union --
1
United State
1
United States - --
1
United States. Department of Defense --
1
United states
1