U.S. single-family home prices rose slightly more than expected in November, while their increase from a year ago was the biggest in almost eight years, according to the results of closely watched survey that was released today, Reuters reported. The S&P/Case Shiller composite index of 20 metropolitan areas gained 0.9 percent on a seasonally adjusted basis. A Reuters poll of economists forecast a rise of 0.8 percent. The 20-city composite index rose 13.7 percent year-on-year, the largest rise since February 2006. Greater Des Moines is not included in the survey.