Performance of subprime mortgages continues to improve as the volume of loans outstanding slowly declines. Some $320.0 billion in subprime mortgages were outstanding as of the end of the first quarter of 2015, according to estimates by Inside Nonconforming Markets. Volume was down 4.2 percent from the previous quarter and 16.0 percent from the first quarter of 2014. The total past-due rate for subprime mortgages fell to 17.60 percent ... [Includes one data chart]