27 visiting now: 14 USA 
4 Russia 
2 China 
2 Denmark 
1 Brazil 
1 Iran 
1 Singapore 
1 Indonesia 
1 Taiwan 
4 Russia 2 China 2 Denmark 1 Brazil 1 Iran 1 Singapore 1 Indonesia 1 Taiwan 4 Russia 2 China 2 Denmark 1 Brazil 1 Iran 1 Singapore 1 Indonesia 1 Taiwan