The boom in Alternative A mortgage securitization through the non-agency MBS market fueled a huge increase in private mortgage conduit business during 2005, according to a new market analysis and ranking by Inside Mortgage Finance. The private conduit business pumped out a record-shattering $923.68 billion of new mortgage securities during the past year, posting a hefty 45.2 percent gain over total production in 2004. That’s an especially dramatic gain since most observers think total… [One data table included]