34 visiting now: 19 USA 
8 Singapore 
6 Russia 
5 Canada 
2 China 
2 Germany 
1 Argentina 
1 UK 
8 Singapore 6 Russia 5 Canada 2 China 2 Germany 1 Argentina 1 UK 8 Singapore 6 Russia 5 Canada 2 China 2 Germany 1 Argentina 1 UK