57 visiting now: 24 USA 
9 Singapore 
6 Canada 
4 Brazil 
3 UK 
3 China 
2 Vietnam 
1 France 
1 Bangladesh 
1 Iran 
1 Belgium 
1 Switzerland 
1 Taiwan 
9 Singapore 6 Canada 4 Brazil 3 UK 3 China 2 Vietnam 1 France 1 Bangladesh 1 Iran 1 Belgium 1 Switzerland 1 Taiwan