Mine for example. Belgium.

The population has not shrunk a single year since the world wars but the natality has been below replacement since the start of the 70's if you take the colloquial replacement natality rate and since the world wars if you take the more realistic one.

I think just about every surrounding country is similar.

That growth is indeed slowing down but that has more to do with the natality continuing to drop.

There are indeed eastern european countries with far less migration which saw declines pulling the average down.