30 visiting now: 13 USA 
9 Singapore 
4 UK 
2 Brazil 
2 China 
2 Belgium 
1 France 
1 Russia 
1 Argentina 
9 Singapore 4 UK 2 Brazil 2 China 2 Belgium 1 France 1 Russia 1 Argentina 9 Singapore 4 UK 2 Brazil 2 China 2 Belgium 1 France 1 Russia 1 Argentina