41 visiting now: 18 USA 
10 Singapore 
5 Canada 
2 Belgium 
2 China 
1 Iran 
1 Australia 
1 UK 
1 Vietnam 
1 Germany 
10 Singapore 5 Canada 2 Belgium 2 China 1 Iran 1 Australia 1 UK 1 Vietnam 1 Germany 10 Singapore 5 Canada 2 Belgium 2 China 1 Iran 1 Australia 1 UK 1 Vietnam 1 Germany