20 visiting now: 11 USA 
2 Canada 
2 China 
1 Singapore 
1 Switzerland 
1 Chile 
1 UK 
1 Germany 
1 Netherlands 
2 Canada 2 China 1 Singapore 1 Switzerland 1 Chile 1 UK 1 Germany 1 Netherlands 2 Canada 2 China 1 Singapore 1 Switzerland 1 Chile 1 UK 1 Germany 1 Netherlands