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There are no official census records of baby names in Germany at all. There's a german website, that has statistics, which are based on projection: https://www.beliebte-vornamen.de/5159-dieter.htm (you'll be able to read the diagram). This is the best I know for this period.

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I can also confirm, what elbowin said, though I think, Dietrich might come back, as many old names are having a revival right now (Dieter probably not, since Dieter Bohlen is still quite popular).