The rise of religious nonbelief is one of the most striking social trends in the United States. My colleague Nate Cohn discusses the trend, with a focus on the recent decline of Americans who identify as Christians, in an article this morning analyzing a large new survey by the Pew Research Center.

The chart here is another way to think about the trend. Pew asks Americans what their religion is and gives several choices for people who don’t identify as belonging to one. One choice is “atheist,” another is “agnostic” and a third is “nothing in particular.” Among people who give that last answer, Pew also asks whether religion is important in their lives.

To create a larger category of the nonreligious, I’ve combined atheists, agnostics and people who said both that they didn’t belong to a religion and that religion wasn’t important to them. This group made up 15.8 percent of the United States population in 2014, up from 10.3 percent only seven years earlier, according to Pew.