Would be unimaginable privately...
I doubt that. So many building savings contracts, Riester pensions, and private annuities have been sold in recent years, all of which yield almost nothing. The capital is tied up forever as well. On top of that, there are many overnight deposits at 0% and the effort people put in to get 0.5% on overnight deposits somewhere in Romania or Bulgaria while inflation is significantly higher...
Private individuals also play along. There are hardly any alternatives. Actually, only the stock market if you can get used to the fluctuations. Although valuations there are so high that honestly, the expected returns for the next few years shouldn’t be particularly high.