31 visiting now: 17 USA 
3 Singapore 
2 Canada 
2 India 
2 China 
2 Germany 
1 Iran 
1 Hong Kong 
1 Taiwan 
3 Singapore 2 Canada 2 India 2 China 2 Germany 1 Iran 1 Hong Kong 1 Taiwan 3 Singapore 2 Canada 2 India 2 China 2 Germany 1 Iran 1 Hong Kong 1 Taiwan