39 visiting now: 25 USA 
9 Singapore 
4 Canada 
2 Brazil 
1 Belgium 
1 UK 
1 China 
1 Iran 
9 Singapore 4 Canada 2 Brazil 1 Belgium 1 UK 1 China 1 Iran 9 Singapore 4 Canada 2 Brazil 1 Belgium 1 UK 1 China 1 Iran