Growth in home prices contributed around 15 percent of the growth in America’s GDP during what is now the longest economic expansion in the country’s history, according to a new report from housing data firm CoreLogic.

The country’s economy has been growing for 121 consecutive months since June 2009, the low point of the Great Recession, as measured by its gross domestic product and industrial output.

CoreLogic also found that since June 2009:

• The total share of homes underwater went from 25.9 percent to 4.1 percent.
• The number of properties flipped – defined as being bought and sold again within a two-year period – reached its highest point at 11.4 percent, in the first quarter of 2018.
• Total home equity in America is $15.8 trillion as of the first quarter of 2019, up from $6.1 trillion in the first quarter of 2009. The average equity per borrower has increased from about $75,000 to $171,000 over the same time period.
• Home prices across the country has increased a cumulative 50 percent and single-family home rents have increased 33 percent since June 2009.

In Massachusetts, the median first-quarter single-family sale price has grown 45 percent since the first quarter of 2009, according to data from The Warren Group, publisher of Banker & Tradesman. The median condominium sale price has grown 59 percent over the same period.

Suffolk County single-family first quarter median home sale prices grew the most between the first quarter of 2009 and the first quarter of 2019, according to The Warren Group, at 114 percent. The first quarter median home sale price in Franklin County grew the least over the same period, at 16 percent.