30 visiting now: 12 Belgium 
8 USA 
3 China 
2 Vietnam 
1 Tanzania 
1 Germany 
1 Indonesia 
1 Russia 
1 Colombia 
8 USA 3 China 2 Vietnam 1 Tanzania 1 Germany 1 Indonesia 1 Russia 1 Colombia 8 USA 3 China 2 Vietnam 1 Tanzania 1 Germany 1 Indonesia 1 Russia 1 Colombia