72 visiting now: 35 USA 
6 Singapore 
6 China 
5 Canada 
4 Brazil 
4 Czech Republic 
3 UK 
3 Mexico 
2 Germany 
2 Hong Kong 
1 Australia 
1 Oman 
1 Finland 
1 Romania 
1 Lithuania 
1 Ecuador 
6 Singapore 6 China 5 Canada 4 Brazil 4 Czech Republic 3 UK 3 Mexico 2 Germany 2 Hong Kong 1 Australia 1 Oman 1 Finland 1 Romania 1 Lithuania 1 Ecuador