The Census Bureau released new data last week that includes the spouses of gay and lesbian couples for the first time.

According to Pew Research Center calculations based on the bureau's 2013 American Community Survey, the number of married adults over the age of 18 dropped to 50.3% from 50.5% in 2012.

Households headed by same-sex married couples increased to nearly 252,000, a notable increase from 2012, when the government estimated the figure at 182,000.

There are 56 million married couples in the U.S.

The Census Bureau previously reclassified two people of the same gender who said they were married as cohabiting partners.

Meanwhile, a Pew Research poll also released last week shows that most LGBT adults believe that society has become more accepting of sexual minorities. Still, a majority of LGBT adults say that they have been discriminated against because of who they are.