The population of the United States grew by 0.73 percent in 2014—an addition of about 2.3 million people, according to estimates the U.S. Census Bureau released this week.
As of Jan. 1, 2015, the bureau estimates the United States will be home to 320,090,857 people. Across the nation, one birth occurs every eight seconds, and one death every 12 seconds, on average.
Those figures don’t mean the country is enjoying a population boom: Half of the growth was due to immigration rather than childbirth. And while the United States currently experiences more births than deaths, the estimated total fertility rate—the number of children a woman will have in her lifetime, on average—remains at just 1.9 births per woman. That is slightly below the replacement level of 2.1 births per woman, a rate last seen in 2007, before the recession.