45 visiting now: 18 USA 
11 Singapore 
6 China 
5 Canada 
4 Russia 
3 UK 
1 Australia 
1 Korea 
11 Singapore 6 China 5 Canada 4 Russia 3 UK 1 Australia 1 Korea 11 Singapore 6 China 5 Canada 4 Russia 3 UK 1 Australia 1 Korea