53 visiting now: 31 USA 
9 Singapore 
6 China 
3 UK 
2 Russia 
2 Germany 
1 Brazil 
1 Canada 
1 Finland 
1 Australia 
9 Singapore 6 China 3 UK 2 Russia 2 Germany 1 Brazil 1 Canada 1 Finland 1 Australia 9 Singapore 6 China 3 UK 2 Russia 2 Germany 1 Brazil 1 Canada 1 Finland 1 Australia