Region
Developing countries --
4
United States --
4
China
3
United States
3
Arab countries
2
China --
2
Arab countries --
1
Czech Republic
1
Czech Republic --
1
Developing countries
1
Great Britain
1
Hong Kong --
1
Malaysia
1
Philippines
1
Philippines --
1
Seattle
1
Sri Lanka
1
Sri Lanka --
1
Turkey
1
Turkey --
1
Washington (State) --
1