40 visiting now: 24 USA 
7 Singapore 
5 China 
4 Canada 
1 Germany 
1 Hong Kong 
1 Brazil 
1 UK 
7 Singapore 5 China 4 Canada 1 Germany 1 Hong Kong 1 Brazil 1 UK 7 Singapore 5 China 4 Canada 1 Germany 1 Hong Kong 1 Brazil 1 UK