39 visiting now: 25 USA 
6 Singapore 
6 Canada 
2 Russia 
2 Australia 
2 China 
1 UK 
1 Germany 
6 Singapore 6 Canada 2 Russia 2 Australia 2 China 1 UK 1 Germany 6 Singapore 6 Canada 2 Russia 2 Australia 2 China 1 UK 1 Germany