Because subversive kikes and their shabbos goys posing as english teachers have infiltrated their schools and brainwashed the youth to not have kids and embrace Weimar degeneracy, such as feminism and LGBT. Young women don't want to get married anymore as a result, adding the cost of living. The government tried to counter this by subsidizing and giving free houses in deserted countryside, but in vain. They failed to notice that the cause was jewish brainwashing.