28 visiting now: 15 USA 
3 Brazil 
3 Pakistan 
2 India 
2 China 
1 Iran 
1 Canada 
1 UK 
3 Brazil 3 Pakistan 2 India 2 China 1 Iran 1 Canada 1 UK 3 Brazil 3 Pakistan 2 India 2 China 1 Iran 1 Canada 1 UK