Just three jumbo mortgage-backed securities were issued in the fourth quarter of 2013, according to a new ranking and analysis by Inside Nonconforming Markets. During the second quarter of the year, one deal was issued every week, on average. Investor demand for jumbo MBS plummeted after interest rates started to increase in May. A number of the deals that were completed in the second half of the year received minimal attention from investors, with at least one planned issuance scrapped ... [Includes one data chart]