Fannie Mae and Freddie Mac recorded significant declines in the volume of single-family mortgages they securitized during the second quarter of 2011, according to a new analysis and ranking based on the Inside Mortgage Finance GSE MarketScope. The two government-sponsored enterprises generated a combined $155.0 billion in single-family mortgage-backed securities during the second quarter, down a hefty 40.6 percent from the first three months of the year. It was the slowest quarter in Fannie/Freddie MBS output since the final three months of 2008, the low ... [includes 3 data charts]