Interest rates on fixed-rate mortgages have been at record lows since December 2011, but a considerable number of borrowers continue to choose adjustable-rate mortgages, according to a ranking and analysis by Inside Mortgage Finance. ARM originations rose 7.7 percent from the first to the second quarter of 2012, a slightly faster rate of increase than the overall market. Although ARM originations over the first half of the year were down 3.6 percent from the same period in 2011, ARMs still accounted for 10.3 percent of total loan production. Most ARMs are...[Includes one data chart]