Fannie Mae and Freddie Mac sold some nonprime mortgage-backed securities during 2013 even though the government-sponsored enterprises have seen strong returns on these holdings in recent quarters. The GSEs held a total of $84.61 billion in nonprime MBS as of the end of 2013, according to a new analysis by Inside Nonconforming Markets. The holdings declined by 18.2 percent compared with the end of 2012 due to a combination of ... [Includes one data chart]