52 visiting now: 30 USA 
9 Singapore 
4 China 
3 UK 
3 Ukraine 
1 Finland 
1 Germany 
1 Argentina 
1 Brazil 
1 Canada 
9 Singapore 4 China 3 UK 3 Ukraine 1 Finland 1 Germany 1 Argentina 1 Brazil 1 Canada 9 Singapore 4 China 3 UK 3 Ukraine 1 Finland 1 Germany 1 Argentina 1 Brazil 1 Canada