31 visiting now: 26 USA 
3 Singapore 
2 Russia 
2 China 
1 Finland 
1 Germany 
1 Iran 
1 Brazil 
1 Canada 
3 Singapore 2 Russia 2 China 1 Finland 1 Germany 1 Iran 1 Brazil 1 Canada 3 Singapore 2 Russia 2 China 1 Finland 1 Germany 1 Iran 1 Brazil 1 Canada