According to Gedanken und Fakten zur Bevölkerungsentwicklung in Ostpreußen, even as late as 1708, only 25% of East Prussians were deutsch (Presumably, these were the people whose primary language was German)

When did most (>50%) East Prussians start speaking German? (More broadly, how did the fraction of German speakers in East Prussia change over time?)

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From Wikipedia: https://en.wikipedia.org/wiki/East_Prussia

In year 1824, shortly before its merger with West Prussia, the population of East Prussia was 1,080,000 people.[7] Of that number, according to Karl Andree, Germans were slightly more than half, while 280,000 (~26%) were ethnically Polish and 200,000 (~19%) were ethnically Lithuanian.[8]

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