37 visiting now: 18 USA 
8 China 
2 Russia 
2 India 
1 Germany 
1 Malaysia 
1 Vietnam 
1 Spain 
1 Canada 
1 Taiwan 
1 Italy 
8 China 2 Russia 2 India 1 Germany 1 Malaysia 1 Vietnam 1 Spain 1 Canada 1 Taiwan 1 Italy