Historically, this housing decline has been a bear, but not the worst of the bear housing markets.

The Winans International Real Estate Index calculates that new home prices in the United States are down 23 percent since March 31, 2007. New homes sales have fallen 71 percent and new property listings are down 34 percent in the same time period.

Sounds bad, but the worst decline of new home prices in the last 150 years was the 68 percent decline from 1929 to 1932. The longest housing bear market was from 1853 to 1858.

"This bear market will probably not end in 2009. Past real estate bear markets ended when the average time it took to sell a new house dropped to 3 1/2 months. Currently, it is taking over 9 months for transactions to close due to tight credit conditions," says company founder Ken Winans.

Source: Winans International