Fannie Mae and Freddie Mac did significantly less business during the first quarter of 2014 along just about every metric you can think of, but the two government-sponsored enterprises saw out-sized declines from their biggest customers. The top five GSE sellers accounted for just 33.3 percent of single-family mortgage deliveries during the first quarter of this year, according to a new Inside Mortgage Trends analysis of ... [Includes two data charts]