Last year’s steady decline in GSE refinance activity continued into 2014 and contributed to an overall dip in the volume of single-family mortgages securitized by Fannie Mae and Freddie Mac, according to a new Inside The GSEs analysis. Fannie and Freddie issued $47.0 billion in single-family mortgage-backed securities in January, a 15.8 percent decline from December 2013 and a steeper 61.9 percent decrease from the same period a year ago.