In early 2012, General Electric (GE) had a book value of equity of $ 116 billion, 10.6 billion shares outstanding, and a market price of $ 17.00 per share. GE also had cash of $ 84 billion, and total debt of $ 410 billion. Three years later, in early 2015, GE had a book value of equity of $ 128 billion, 10.0 billion shares outstanding with a market price of $ 25.00 per share, cash of $ 85 billion, and total debt of $ 302 billion. Over this period, what was the change in GE's

Question: From 2012 until 2015, what was GE's change in market debt-equity ratio?