40 visiting now: 21 USA 
8 Singapore 
4 UK 
3 Canada 
3 China 
1 Belgium 
1 Zimbabwe 
1 Germany 
1 Russia 
8 Singapore 4 UK 3 Canada 3 China 1 Belgium 1 Zimbabwe 1 Germany 1 Russia 8 Singapore 4 UK 3 Canada 3 China 1 Belgium 1 Zimbabwe 1 Germany 1 Russia