28 visiting now: 10 USA 
6 China 
4 Singapore 
3 Russia 
2 Germany 
1 France 
1 Taiwan 
1 Lithuania 
6 China 4 Singapore 3 Russia 2 Germany 1 France 1 Taiwan 1 Lithuania 6 China 4 Singapore 3 Russia 2 Germany 1 France 1 Taiwan 1 Lithuania