Housing Starts and excess/deficit of housing stock, assuming historical average starts are what we need for stable housing stock
This shows housing starts, across the USA. Original data:
fred.stlouisfed.org/series/HOUST
Blue Line is starts, plotted on the left axis. Red line is ~average starts 1960-2007 (1550) on right axis, and ~0 for the left axis. The left axis plots the excess or deficit assuming 1550 is about right.