United States 571
Italy 230
Russian Federation 20
Germany 18
France 16
Canada 10
India 9
Ireland 6
Switzerland 5
European Union 5
Finland 4
United Kingdom 4
Spain 3
Korea, Republic of 3
Sweden 2
Iran, Islamic Republic of 2
Argentina 2
Portugal 2
Belgium 2
Chile 2
Peru 1
Mexico 1
Japan 1
Norway 1
Israel 1
Ecuador 1
Czech Republic 1
Brazil 1
South Africa 1