U.S. home prices slid further down in December, concluding a quarter that saw an 18.2% drop in home prices from year-ago levels, according to a measure published by Standard & Poor’s.

The S&P Case-Shiller U.S. National Home Price Index, a measure that covers all nine U.S. census divisions, recorded an 18.2% decline in the fourth quarter of 2008 from the fourth quarter of 2007. This is the largest drop in the index’s 21-year history.

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