19 visiting now: 7 USA 
4 Belgium 
2 China 
2 Russia 
1 Germany 
1 France 
1 Bahrain 
1 Mexico 
4 Belgium 2 China 2 Russia 1 Germany 1 France 1 Bahrain 1 Mexico 4 Belgium 2 China 2 Russia 1 Germany 1 France 1 Bahrain 1 Mexico