Fannie, Freddie and Ginnie dominated the mortgage securities market for decades, but their hegemony has unraveled in the past two years. A new Inside MBS & ABS analysis indicates that the record-setting non-agency MBS market for the first time ever became the largest source of new mortgage securities issuance in 2005. The $1.191 trillion of non-agency MBS produced last year accounted for a record 55.6 percent of total MBS production. That was up from a… [One data table included]