17 visiting now: 7 USA 
3 China 
2 Belgium 
1 Germany 
1 Cambodia 
1 Canada 
1 Nigeria 
1 Russia 
3 China 2 Belgium 1 Germany 1 Cambodia 1 Canada 1 Nigeria 1 Russia 3 China 2 Belgium 1 Germany 1 Cambodia 1 Canada 1 Nigeria 1 Russia