Home prices rose more than was anticipated, according to new data from the S&P/Case-Shiller U.S. National Home Price Index. This happened as homebuyer demand continues to outweigh supply in the housing market.

The national home price index jumped 5.8 percent recently, while analysts were expecting home prices to climb by 5.7 percent for the month, according to Thomson Reuters consensus estimates. This represents the most gains in 32 months.

David Blitzer, managing director and chairman of the index committee at S&P Dow Jones Indices, said the low stock of existing homes for sale — currently about 3.8 months worth of supply at current sales rates — is bolstering the price increases across the board.

Housing affordability has declined since 2012 as the pressure of higher prices has been a larger factor than stable to lower mortgage rates.

The cities with the biggest annual price gains were Seattle, Portland, Oregon and Dallas, according to the groups’ index.