38 visiting now: 23 USA 
7 Canada 
2 Germany 
2 Singapore 
1 Taiwan 
1 Argentina 
1 UK 
1 China 
7 Canada 2 Germany 2 Singapore 1 Taiwan 1 Argentina 1 UK 1 China 7 Canada 2 Germany 2 Singapore 1 Taiwan 1 Argentina 1 UK 1 China