Fannie Mae and Freddie Mac combined did more business in single-family mortgage-backed securities issuance in 2012 than in any year since 2003, with a growing share of their business coming from small and mid-sized lenders, according to an Inside The GSEs analysis. The two GSEs pumped out a staggering $1.266 trillion in new single-family MBS in 2012, a 48.1 percent increase over their total production in 2011. It marked the biggest annual output by Fannie and Freddie since the all-time record of $1.912 trillion nine years earlier.