39 visiting now: 29 USA 
6 Singapore 
2 Brazil 
1 Belgium 
1 UK 
1 China 
1 Germany 
1 Russia 
6 Singapore 2 Brazil 1 Belgium 1 UK 1 China 1 Germany 1 Russia 6 Singapore 2 Brazil 1 Belgium 1 UK 1 China 1 Germany 1 Russia