66 visiting now: 36 USA 
8 Singapore 
4 China 
4 Czech Republic 
3 Brazil 
3 Canada 
3 UK 
2 Germany 
1 India 
1 Poland 
1 Venezuela 
1 Saudi Arabia 
1 Australia 
1 Bangladesh 
1 Switzerland 
1 Belgium 
8 Singapore 4 China 4 Czech Republic 3 Brazil 3 Canada 3 UK 2 Germany 1 India 1 Poland 1 Venezuela 1 Saudi Arabia 1 Australia 1 Bangladesh 1 Switzerland 1 Belgium