A new report shows rising sales and a smaller supply of available homes is driving up home prices.
The Standard & Poor's/Case-Shiller 20-city home price index rose 6.8 percent in December compared with the same month a year ago. That's up from a 5.5 percent annual gain in November.
Nationwide, the report says prices rose 7.3 percent in 2012. That is similar to other home price measures that show a healthy gain last year.
Prices also rose in December compared with a year ago in 19 of the 20 cities tracked by the index. New York was the only metro area to show a decrease.
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