61 visiting now: 35 USA 
8 Singapore 
5 China 
4 Czech Republic 
2 UK 
2 Germany 
2 Brazil 
1 Argentina 
1 Switzerland 
1 Australia 
1 Bangladesh 
1 Poland 
1 Belgium 
1 Venezuela 
1 Saudi Arabia 
8 Singapore 5 China 4 Czech Republic 2 UK 2 Germany 2 Brazil 1 Argentina 1 Switzerland 1 Australia 1 Bangladesh 1 Poland 1 Belgium 1 Venezuela 1 Saudi Arabia