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Home prices in 20 U.S. cities dropped in the year ended May by the most in 18 months, adding to evidence the housing market is struggling.

The S&P/Case-Shiller index of property values in 20 cities fell 4.5 percent from May 2010, the group said today in New York. The decline matched the median forecast of 32 economists surveyed by Bloomberg News.

A pipeline of foreclosures and uneven demand will keep prices from rising this year, discouraging new-home construction and delaying a rebound in housing. Shrinking home equity and an unemployment rate at 9.2 percent are weighing on consumer spending, which accounts for about 70 percent of the economy.