The four Scandinavian countries bear close resemblances although Finland had a more pronounced resurgence after the Second War, and underwent an equally marked reduction in the late 1960s from which it has since recovered but which anticipated the clear drop in age groups numbers of the other three in the late 1970s..

Poland seems to have undergone the more violent changes, displaying two particularly pronounced minima, i.e. in early 1940s and the late 1960s. in every case the recent birth numbers have dropped to about half of those around 1980