Region
China
United States --
20
China --
19
United States
18
Taiwan
4
Taiwan --
4
Japan
3
Japan --
3
Southeast Asia
2
Southeast Asia --
2
Soviet Union
2
Soviet Union --
2
Asia --
1
Asia, Southeastern
1
Asia, Southeastern --
1
Burma --
1
East Asia
1
East Asia --
1
India
1
India --
1
Pacific Area --
1
Pacific area
1
Pacific area --
1
Pakistan
1
Pakistan --
1
Russia (Federation)
1
Russia (Federation) --
1
South Asia
1
South Asia --
1
United Nations
1
United states --
1