24 visiting now: 10 USA 
6 China 
2 Japan 
2 Germany 
1 Taiwan 
1 India 
1 UK 
1 Russia 
6 China 2 Japan 2 Germany 1 Taiwan 1 India 1 UK 1 Russia 6 China 2 Japan 2 Germany 1 Taiwan 1 India 1 UK 1 Russia