40 visiting now: 21 USA 
7 China 
3 Brazil 
2 Singapore 
2 UK 
2 Russia 
1 Germany 
1 Pakistan 
1 Sweden 
7 China 3 Brazil 2 Singapore 2 UK 2 Russia 1 Germany 1 Pakistan 1 Sweden 7 China 3 Brazil 2 Singapore 2 UK 2 Russia 1 Germany 1 Pakistan 1 Sweden