27 visiting now: 13 USA 
4 Russia 
3 China 
2 Denmark 
1 Brazil 
1 Indonesia 
1 Germany 
1 Singapore 
1 Taiwan 
4 Russia 3 China 2 Denmark 1 Brazil 1 Indonesia 1 Germany 1 Singapore 1 Taiwan 4 Russia 3 China 2 Denmark 1 Brazil 1 Indonesia 1 Germany 1 Singapore 1 Taiwan