Region
United States --
10
United States
7
China
5
China --
5
Asia --
4
Asia
3
Asia, Southeastern
2
Asia, Southeastern --
2
Europe --
2
Pacific Area
2
Pacific Area --
2
Southeast Asia --
2
Soviet Union
2
Soviet Union --
2
European Union countries
1
European Union countries --
1
Japan --
1
Pacific area
1
Pacific area --
1
Russia (Federation)
1
Russia (Federation) --
1
South Asia
1
South Asia --
1
Southeast Asia
1
United State --
1
United States --
1