57 visiting now: 33 USA 
9 Singapore 
4 Australia 
3 UK 
2 Belgium 
2 Canada 
2 China 
2 Argentina 
2 Iran 
1 Vietnam 
1 Poland 
1 Brazil 
1 Russia 
1 Lithuania 
9 Singapore 4 Australia 3 UK 2 Belgium 2 Canada 2 China 2 Argentina 2 Iran 1 Vietnam 1 Poland 1 Brazil 1 Russia 1 Lithuania