According to Pew Research Center and United States Bureau of Justice Statistics, from December 31, 2009, to December 31, 2015, inmates sentenced in U.S. federal custody declined by five percent. This is the largest decline in sentenced inmates in U.S. federal custody of any president since Jimmy Carter. By contrast, the federal prison population increased significantly under presidents Ronald Reagan, George H. W. Bush, Bill Clinton, and George W. Bush.