25 visiting now: 8 USA 
5 Russia 
5 China 
3 Singapore 
1 India 
1 Taiwan 
1 Iran 
1 Brazil 
5 Russia 5 China 3 Singapore 1 India 1 Taiwan 1 Iran 1 Brazil 5 Russia 5 China 3 Singapore 1 India 1 Taiwan 1 Iran 1 Brazil