28 visiting now: 11 USA 
10 China 
1 Sudan 
1 Colombia 
1 Singapore 
1 Brazil 
1 France 
1 Congo 
1 Iran 
10 China 1 Sudan 1 Colombia 1 Singapore 1 Brazil 1 France 1 Congo 1 Iran 10 China 1 Sudan 1 Colombia 1 Singapore 1 Brazil 1 France 1 Congo 1 Iran