18 visiting now: 10 USA 
6 Russia 
2 Belgium 
2 Vietnam 
1 Latvia 
1 Taiwan 
1 Brazil 
1 Germany 
1 Iran 
6 Russia 2 Belgium 2 Vietnam 1 Latvia 1 Taiwan 1 Brazil 1 Germany 1 Iran 6 Russia 2 Belgium 2 Vietnam 1 Latvia 1 Taiwan 1 Brazil 1 Germany 1 Iran