Hungary just published the result of a census ten years after the last one: turns out there's 300k less people than they expected (total population is 9.6M), and the country population is back to the size of ~1950.
Hungary and other countries in Central and Eastern Europe, and even Southern Europe for that matter, have the added problem of EU-wide migration - lots of people, especially young people, choose to go live in a more developed country in the Western EU (usually France and Germany).
The same is happening in Europe.
Hungary just published the result of a census ten years after the last one: turns out there's 300k less people than they expected (total population is 9.6M), and the country population is back to the size of ~1950.