I never, ever would have guessed that...or even put Dubai in the top 20. It’s not much of a tourist destination. Population is 2.7M, but temporary workers add 50%. It must be all the temps coming and going.
I don’t necessarily believe it’s a destination for most people. In my case for a trip from Frankfurt to New Zealand this fall....I have to route through the hub at Dubai, and will be sitting there for three hours for the next flight.
It is a major stopover point on Europe to Asia routes.