The government-sponsored enterprises’ share of purchase-mortgage originations has increased each of the last two years, according to a new analysis by Inside Mortgage Trends. The shift in market share includes decreased purchase-mortgage originations for the FHA and a lack of housing inventory, prompting increased home prices. Some $377.2 billion in agency purchase mortgages were originated in 2012, with a 66.5 percent share for Fannie Mae and Freddie Mac combined. In 2010, the GSEs ... [Includes one data chart]