23 visiting now: 9 USA 
6 Belgium 
3 China 
1 Germany 
1 Vietnam 
1 Ecuador 
1 South Africa 
1 Nigeria 
6 Belgium 3 China 1 Germany 1 Vietnam 1 Ecuador 1 South Africa 1 Nigeria 6 Belgium 3 China 1 Germany 1 Vietnam 1 Ecuador 1 South Africa 1 Nigeria