I would imagine most of the professional staff are in urban centres.
It refers back to one of the questions you answered earlier, when you said it's hard to track people in rural areas because of the crumbling infrastructure. I think that's the term you used.
But I would say that once people in rural areas get jobs in the public service, it would probably be an area where they would want to stay. If the public service is working and its infrastructure is crumbling, it means everybody else's is crumbling too, doesn't it?