U.S. single-family home prices picked up in December, closing out 2012 with the biggest yearly gain in more than six years as the housing market got back on its feet, a closely watched survey showed on Tuesday.

The S&P/Case Shiller composite index of 20 metropolitan areas rose 0.9 percent in December on a seasonally adjusted basis, topping expectations for a gain of 0.5 percent.

On a non-adjusted basis, prices were up 0.2 percent.

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