WASHINGTON -- U.S. home prices jumped in August by a near-record amount from a year earlier, as Americans eager to buy a home drove up prices on a dwindling number of properties.

       The S&P CoreLogic Case-Shiller 20-city home price index soared 19.7% in August compared with a year ago, just below July's 20% jump, which was the largest gain on records dating back to 2000. Home prices are now at all-time highs in all 20 cities in the index.

       Home sales have been healthy for most of this year, spurred by an ongoing desire among many people for greater space to wait out the coronavirus pandemic. Mortgage rates have also been historically low, though they have risen in recent weeks, and many Americans have become wealthier since the pandemic as stock prices have moved steadily higher, enabling them to afford a new home.

       Phoenix reported the biggest price increase among the 20 cities that make up the index, as it has for more than two years. Its home prices increased 33.3% in August compared with a year earlier. Home prices in San Diego jumped 26.2%, the second highest, and Tampa's home prices rose 25.9%, the third-largest gain.