The market share for higher priced mortgages doubled in 2011 compared with the previous year, according to an Inside Nonconforming Markets analysis of Home Mortgage Disclosure Act data released last week. However, the market share for the proxy for subprime mortgages used by federal regulators remained tiny at 1.2 percent of the dollar volume of originations reported in 2011. Some $12.38 billion in higher priced mortgages were sold in 2011, up ... [Includes one data chart]