The U.S. housing sector has registered another ignominious statistic. Home prices in a 20-city sample plunged 14.4% in March 2008 (PDF), on a year-over-year basis, according to the S&P / Case-Shiller U.S. National Home Price survey released Tuesday. Meanwhile, prices in a 10-city survey plummeted 15.3%.

It was the largest decline in the survey's 20-year history, Case-Shiller said.

Economists surveyed by Bloomberg News had expected home prices in the Case-Shiller 20-city survey to decline 14.2% in March 2008 on a year-over-year basis.

The areas with the largest percentage declines were: Las Vegas, -25.9%; Miami, -24.6%, and Phoenix, -23.0%. Only one city in the survey -- Charlotte, N.C. -- appreciated, with prices there rising just a scant 0.8%.

Percentage price changes in other major U.S. cities were as follows: New York, -7.4%, Los Angeles, -21.7%, Chicago, -10.0%, Boston, -5.9%, San Francisco, -20.2%, Washington, D.C., -14.7%, Miami, -24.6%, and Seattle, -4.4%.

Economic Analysis: Another horrible U.S. housing sector statistic, and the sector remains in deep recession. Economists differ regarding whether the U.S. housing sector has bottomed: some see a housing recovery as early as Q4 2008, while others say it won't start until mid-2009. In either event, it's going to be a while before new home builders can resume typical building schedules and get out there and make some money -- a fact that suggests U.S. home prices are likely to continue to decline for at least the next two quarters, and probably longer.