46 visiting now: 22 USA 
7 China 
6 Netherlands 
3 UK 
2 India 
1 Brazil 
1 France 
1 Singapore 
1 Switzerland 
1 Germany 
1 Russia 
7 China 6 Netherlands 3 UK 2 India 1 Brazil 1 France 1 Singapore 1 Switzerland 1 Germany 1 Russia