27 visiting now: 15 USA 
4 China 
2 Singapore 
1 Poland 
1 France 
1 Mexico 
1 Slovenia 
1 Norway 
1 Germany 
4 China 2 Singapore 1 Poland 1 France 1 Mexico 1 Slovenia 1 Norway 1 Germany 4 China 2 Singapore 1 Poland 1 France 1 Mexico 1 Slovenia 1 Norway 1 Germany