23 visiting now: 7 USA 
4 China 
3 Spain 
2 Singapore 
1 Latvia 
1 Brazil 
1 Russia 
1 France 
1 Slovakia 
1 Germany 
1 India 
1 UK 
4 China 3 Spain 2 Singapore 1 Latvia 1 Brazil 1 Russia 1 France 1 Slovakia 1 Germany 1 India 1 UK