From https://metaculus.com/questions/16762/2023-housing-market-collapse/

The last time a housing price drop of >= 15% in a year was in 2008 (18%). The collapse was due to the subprime housing crisis.

Home prices increased by double digits during the Covid pandemic years until mid 2022. Since then it has declined. While some economists predict a 15-20% "crash" into early next year, many others do not agree but see smaller decreases in value.