Are you sure about these numbers? As ROI doesn't make any sense to me in context of the new investments built solely for rent. How does it work?
https://www.numbeo.com/property-investment/rankings.jsp
The ROI absolutely does not make sense but it's real. A large portion of the world believe that the only two investment classes are real estate and government bonds.
We would be all better off if people invested in the stock market instead of “investing” in properties (including landlords)
Then, who builds the new apartments that people rent? If 50% of people in Germany rent and there is no ROI from building for rent, then who finances the new buildings??