Of course it's decreased - you only need to look at the traffic and the abandoned cars at the airports to see that....
By how much?
Well, as so many of the expats are involved in construction (and paid a pittance = slave labour) have they gone?
Or, is it that - in the same way that there is hardly any deaths now (6 dead a few months ago when a floor of a 5 star hotel under construction collapsed in Ajman (fact) never reported - do they just get sent back and there's no official recognition?
Who knows.
I certainly don't....