Comment on
Question about real wages of different income percentiles.
US official data is here: https://fred.stlouisfed.org/tags/series?t=bls%3Bwages
Those are in 1982-84 dollar amounts.
No idea about German data.
For wages/income/wealth data you usually want to look at the median values, not average. Average gets way skewed by the super rich, so the average value is typically far from the common person. Median shows what the common person earns.