Crawling (39%/114% by pop)
Been stuck like this for ages, although "by pop" has gone up slightly.
Oh, well; I meant the actual population, but this indicates that's somewhere around 40% too.
And the messages at turn don't talk about anyone leaving the region, it just shows the population dropping? If that's the case, then it probably is the RCs, and the only current ways to prevent them from draining your population are to let them sit full, or to reduce their size or close them down.
It might be worthwhile to add an option to temporarily disable recruitment into a given center.