California continued to be the leading source of new single-family Fannie Mae and Freddie Mac mortgages during 2012, according to a new Inside The GSEs analysis. A total of $296.1 billion of home loans in the Golden State were securitized by the two GSEs during the 12 months ending on Dec. 31, 2012, accounting for 23.1 percent of their total business for the year. That was up 51.9 percent from total California Fannie/Freddie production back in 2011, while the overall GSE market rose 50.1 percent from a year ago. Although fixed-rate mortgages continued to dominate the GSE market throughout 2012, California produced $11.0 billion in adjustable-rate mortgages 26.5 percent of the national total. ARMs accounted for just 3.2 percent of total GSE volume.