Mortgage lenders saw a noticeable decline in refinancing of underwater Fannie Mae and Freddie Mac mortgages during the second quarter of 2013, according to a new Inside Mortgage Trends analysis of mortgage-backed securities data. Overall refinance volume at the two government-sponsored enterprises declined by 13.6 percent from the first quarter of 2013 to the second, although refi activity continued to make up a huge 75.8 percent of GSE business. Deliveries of Home Affordable Refinance Program ... [Includes two data charts]