Residential mortgage securitization rates declined in the third quarter of 2011, but surging volume in the primary market will push new MBS issuance higher in coming months. A total of $247.5 billion of residential MBS backed by newly originated loans were issued during the third quarter, representing a relatively low 76.1 percent of the supply of new home loans originated by lenders during the period, according to an Inside MBS & ABS analysis. During the third quarter, about 67 percent of single-family mortgages securitized by Fannie Mae were...(Includes one data chart)