Region
United States --
32
United States
29
Japan
7
Japan --
6
China
5
China --
5
Korea (South)
3
Korea (South) --
3
Singapore
3
Singapore --
3
Asia
2
Canada
2
Caribbean Area
2
Caribbean Area --
2
Central America
2
Central America --
2
Developing countries
2
Developing countries --
2
Europe
2
Europe --
2
Asia --
1
Canada --
1
Hong Kong (China)
1
Hong Kong (China) --
1
Korea ()South) --
1
Malaysia
1
Malaysia --
1
Mexico
1
Mexico --
1
New Zealand
1
New Zealand --
1
Soviet Union
1
Soviet Union --
1