Same in Finland, and from what I've heard, in most of the developed world. Many young people simply don't want to get kids, and there's probably a demographic crisis looming over the horizon. Migration will probably be used to keep increasing the population initially, but at some point we will run out of immigrants.

The way I see it, there are two ways out:

1) We accept that the population cannot keep growing forever, and prepare ourselves for a society where older people are going to be increasingly common.

2) We coerce, or force young people start breeding. I don't really know how that could be done without massive human rights violations.

There is, of course, the idea of vat-grown children, but that seems somewhat far-fetched.