According to the Case-Shiller index, home prices are down 4.5% over the past year. Prices dropped 1.7% in the third quarter, which was the largest drop in the index's 20-year history.

Former boom towns in Florida and Southern California have now passed Detroit for the dubious honor of having the largest declines in the past year. Prices are still up in the Pacific Northwest and in areas of the South, but they're rising at a slower pace.

Fifteen of the 20 cities tracked in the index have seen prices fall in the past year, led by Tampa, Fla., with an 11.1% decline, followed by Miami with a 10% loss and Detroit with a 9.3% loss. Indeed, eight of the 20 cities recorded their largest-ever year-over-year price declines in September.

On a year-over-year basis, prices were up in five cities, led by Seattle and Charlotte, N.C., with 4.7% increases. After adjusting for inflation of 3.7% in the past year, real prices were up in just two of 20 cities.

Here are the year-over-year nominal price changes for the 20 cities covered by the index:

Tampa, down 11.1%; Miami, down 10%; Detroit, down 9.6%: San Diego, down 9.6%; Las Vegas, down 9%; Phoenix, Ariz., down 8.8%; Los Angeles, down 7%; Washington, D.C., down 6.6%; San Francisco, down 4.6%; Minneapolis, down 4.5%; Cleveland, down 4%; New York, down 3.6%; Boston, down 3.2%; Chicago, down 2.5%; Denver, Colo., down 0.9%; Dallas, up 0.2%; Atlanta, up 0.4%; Portland, Ore., up 2.2%; Charlotte, up 4.7%; and Seattle, up 4.7%.