30 visiting now: 21 USA 
4 Singapore 
3 UK 
2 China 
2 Hong Kong 
2 Australia 
1 Russia 
1 Belgium 
4 Singapore 3 UK 2 China 2 Hong Kong 2 Australia 1 Russia 1 Belgium 4 Singapore 3 UK 2 China 2 Hong Kong 2 Australia 1 Russia 1 Belgium