22 visiting now: 10 USA 
3 Vietnam 
2 Russia 
1 Iraq 
1 Colombia 
1 Iran 
1 Germany 
1 Pakistan 
1 India 
1 Canada 
3 Vietnam 2 Russia 1 Iraq 1 Colombia 1 Iran 1 Germany 1 Pakistan 1 India 1 Canada 3 Vietnam 2 Russia 1 Iraq 1 Colombia 1 Iran 1 Germany 1 Pakistan 1 India 1 Canada