San Diego County’s home prices in April dropped at the slowest pace in three years, the Standard & Poor’s Case-Shiller Home Price Index showed Tuesday.

The index, which measures resale house prices on a three-month rolling average for 20 metro areas, stood at 144.43 points for San Diego in April, down only 0.13 point from March, the smallest month-to-month change since June 2006, when the index rose 0.46 point from the month before.

On a year-over-year basis, the index was off 20.01 percent from April 2008, the smallest year-over-year decline since February last year.