33 visiting now: 15 USA 
9 Singapore 
4 Canada 
3 China 
2 UK 
1 Iran 
1 Bangladesh 
1 Belgium 
1 Brazil 
9 Singapore 4 Canada 3 China 2 UK 1 Iran 1 Bangladesh 1 Belgium 1 Brazil 9 Singapore 4 Canada 3 China 2 UK 1 Iran 1 Bangladesh 1 Belgium 1 Brazil