If Kim wants to increase his population, he could import a whole bunch of Gazans.
This!
There is no place on earth where it is rising.
Which is not a good thing.
Currently we are at 2.4 births per woman which is just above replacement and the majority of the over replacement rate births happen in places with high child mortality rates. So these kids tend not to become adults.
We will not vanish tomorrow but it is a trend that has been going on since 1950 and it has been world wide.