The number of homeowners with negative equity continues to fall, but not fast enough to return the housing market to “normal” any time soon, according to Zillow. At just under 20 percent of all homes with mortgages, negative equity is still “roughly four times what it is in a healthier market.,” Zillow’s chief economist, Stan Humphries, said, “another sign of how distorted the market continues to be, and how far we still have to go on the road back to normal.”