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The Case-Shiller Home Price Indices are quarterly nominal house price indices for the United States.
The following graph shows the price declines from the peak for each city included in S&P/Case-Shiller indices.
In Phoenix, house prices have declined more than 50% from the peak. At the other end of the spectrum, prices in Charlotte and Dallas are off about 11% to 12% from the peak. Prices have declined by double digits everywhere.