Tampa Bay area home prices have backtracked to where they were five years ago, according to the S&P/Case-Shiller home price index released Tuesday. Local housing values slid 4.4 percent from December to January and 23.3 percent from January 2008 to January 2009. Values are off 37.3 percent since the July 2006 peak, Case-Shiller said. The Tampa Bay area was seventh worst on the 20-city index, lauded for its accuracy since it measures repeat sales of individual homes. The usual housing market basketcases led the list of annual price losers: Phoenix (-35 percent), Las Vegas (-32.5 percent ), San Francisco (-32.4 percent), Miami (-29.4 percent), Los Angeles (-25.8 percent) and San Diego (-24.9 percent).