is the crude birth rate of germany since 1800. You see two noticeable dips - One in about 1920, and a smaller one in 1970.
1919 is the year in which germany introduced four years of mandatory primary school, after having increased the state-funded schools since about 1910. And immediately it causes such an huge drop in birthrates. You'll also notice, that the birth-rate remained low in 1933-1945, even when the Nazis were in power, and pretty much told every german girl that her highest duty and honor as a woman is to be a mother that gives birth to many german children. And the drop in 1970 - which is much smaller than the drop in 1920 - possibly had something to do with the invention of birthcontrol pills, but I wouldn't wonder if they also had some school-reform in about that time, where they increased the mandatory years of public-school attendance from something like 6 to something like 10. I believe I've heard such a thing.
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