68 visiting now: 34 USA 
9 Canada 
8 Singapore 
3 Brazil 
3 China 
3 Czech Republic 
3 UK 
2 Germany 
1 Poland 
1 Venezuela 
1 Saudi Arabia 
1 Australia 
1 Bangladesh 
1 Switzerland 
1 Belgium 
1 India 
9 Canada 8 Singapore 3 Brazil 3 China 3 Czech Republic 3 UK 2 Germany 1 Poland 1 Venezuela 1 Saudi Arabia 1 Australia 1 Bangladesh 1 Switzerland 1 Belgium 1 India