Región
United States
17
Great Britain
9
France
8
Europe
5
China
3
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3
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Japan
3
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2
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2
Asia
1
Atlantic Ocean Region
1
Caribbean Area
1
Developing countries
1
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1
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1
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1
Former Yugoslav republics
1
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1
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1
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1
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1
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1
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1
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1
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1
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1
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1
Spain
1
Tehran
1
Ukraine
1
Verenigde Staten
1