Resolves according to the Real Median Household Adjusted Income After Taxes and Transfers Section of the Distribution of Household Income in 2024 report by The Congressional Budget Office. Here's the 2022 report. See the supplemental data excel sheet for the statistic.

It fell 7.2% during the first 2 years according to the CBO, but rose during the last 2 years according to the sources I'm aware of that have published for those years. Our World in Data found it decreased 2.8% during the Biden administration, but that's a small enough decrease that differences in methodology could outweigh it.