68 visiting now: 31 USA 
9 China 
7 Canada 
6 UK 
6 Singapore 
2 Czech Republic 
2 Germany 
2 Brazil 
1 India 
1 Japan 
1 Latvia 
1 Australia 
1 Belarus 
1 South Africa 
1 Hong Kong 
1 Spain 
9 China 7 Canada 6 UK 6 Singapore 2 Czech Republic 2 Germany 2 Brazil 1 India 1 Japan 1 Latvia 1 Australia 1 Belarus 1 South Africa 1 Hong Kong 1 Spain