36 visiting now: 21 USA 
6 Canada 
4 China 
2 Australia 
2 Germany 
1 Russia 
1 Argentina 
1 UK 
6 Canada 4 China 2 Australia 2 Germany 1 Russia 1 Argentina 1 UK 6 Canada 4 China 2 Australia 2 Germany 1 Russia 1 Argentina 1 UK