Treasury yields fell from a week ago, helping to drive mortgage rates down to start the year. The 30-year fixed-rate mortgage fell 4 basis points from a week ago to 3.95 percent in the year’s first survey. Despite increases in short-term interest rates, long-term interest rates remain subdued. The 30-year mortgage rate is down a quarter of a percentage point from where it was a year ago and the spread between the 30-year fixed and 5/1 adjustable rate mortgage is the lowest since 2009.