The non-prime mortgage investments held by Fannie Mae and Freddie Mac continued to slowly drain away in 2009, shrinking by 4.4 percent in the fourth quarter to $565.5 billion, according to a new Inside B&C Lending analysis. That was down 16.4 percent from the end of 2008. Fannie had the larger non-prime portfolio at $312.4 billion at the end of 2009, including $251.1... [Includes one chart and one graph]