43 visiting now: 30 USA 
8 Singapore 
3 India 
3 Poland 
2 Germany 
2 UK 
2 Russia 
1 Mexico 
1 Belgium 
1 Canada 
8 Singapore 3 India 3 Poland 2 Germany 2 UK 2 Russia 1 Mexico 1 Belgium 1 Canada 8 Singapore 3 India 3 Poland 2 Germany 2 UK 2 Russia 1 Mexico 1 Belgium 1 Canada