23 visiting now: 6 USA 
5 Vietnam 
4 Russia 
2 Brazil 
2 Belgium 
1 Israel 
1 China 
1 Colombia 
1 Germany 
5 Vietnam 4 Russia 2 Brazil 2 Belgium 1 Israel 1 China 1 Colombia 1 Germany 5 Vietnam 4 Russia 2 Brazil 2 Belgium 1 Israel 1 China 1 Colombia 1 Germany