28 visiting now: 13 USA 
5 Russia 
4 China 
2 Japan 
1 Ethiopia 
1 Singapore 
1 Hong Kong 
1 Taiwan 
5 Russia 4 China 2 Japan 1 Ethiopia 1 Singapore 1 Hong Kong 1 Taiwan 5 Russia 4 China 2 Japan 1 Ethiopia 1 Singapore 1 Hong Kong 1 Taiwan