Fannie Mae and Freddie Mac dominated the residential mortgage market to a greater degree in 2012 than the GSEs ever had before, according to a new Inside The GSEs analysis. Fannie and Freddie issued a whopping $1.675 trillion of new single-family mortgage-backed securities last year, which equaled 75.7 percent of total market production. That was up from 72.1 percent in 2011 and just shy of the record 77.0 percent the GSEs recorded back in 2008. It was also the biggest annual output since 2009, when Fannie and Freddie issued $1.776 trillion in new MBS. Although part of the increase in GSE share of new MBS issuance last year resulted from the rapid growth of the Home Affordable Refinance Program, their peak market share for the year came early, during the first quarter. HARP activity was heaviest during the second and third quarters.