On the Graph below (which I know is pretty hard to see =/ sorry) The dotted line represents the United States average HOVR over the years, and the other colored solid lines are where particular states have been at based on the U.S. average.
1. United States Census http://www.census.gov/hhes/www/housing/hvs/hvs.html
2. The Federal Reserve Band of Minneapolis http://www.minneapolisfed.org/publications_papers/pub_display.cfm?id=2269