Note. April 2022 data is the latest available from Case-Shiller as I write this on June 28, 2022. The data is a 3-month moving average so what they call April is really the February-April average.
Click on images to see full-size, interactive versions
Note. You can find interactive versions of these charts here.
Instead of deflating by CPI to get real repayments, you could deflate by incomes to get repayments as a share of income. Because since the 2005 peak, incomes have risen much more than CPI