70 visiting now: 31 USA 
24 China 
9 Singapore 
4 UK 
2 Canada 
1 France 
1 Germany 
1 Iran 
1 Switzerland 
1 Finland 
24 China 9 Singapore 4 UK 2 Canada 1 France 1 Germany 1 Iran 1 Switzerland 1 Finland 24 China 9 Singapore 4 UK 2 Canada 1 France 1 Germany 1 Iran 1 Switzerland 1 Finland