36 visiting now: 19 USA 
8 China 
2 Russia 
1 Austria 
1 Spain 
1 Brazil 
1 Romania 
1 Vietnam 
1 Germany 
1 UK 
8 China 2 Russia 1 Austria 1 Spain 1 Brazil 1 Romania 1 Vietnam 1 Germany 1 UK 8 China 2 Russia 1 Austria 1 Spain 1 Brazil 1 Romania 1 Vietnam 1 Germany 1 UK