25 visiting now: 10 USA 
6 China 
2 UK 
2 Russia 
2 Germany 
1 Singapore 
1 Taiwan 
1 Malaysia 
6 China 2 UK 2 Russia 2 Germany 1 Singapore 1 Taiwan 1 Malaysia 6 China 2 UK 2 Russia 2 Germany 1 Singapore 1 Taiwan 1 Malaysia