The housing market experienced a consistent downturn from 2013 to 2016 and then remained at a constant value of zero from 2016 to 2019. This could indicate a period of significant decline followed by a stabilization or lack of change in housing values. It’s worth noting that a constant level of zero might suggest a challenging situation, possibly reflecting a period of economic downturn or other factors affecting the real estate market. If you have more specific details or questions about this trend, feel free to provide additional information for a more detailed response.