. the graph assumes $ 100 originally invested on december 31 , 2009 in each of our series a common stock , series b common stock and series c common stock , the s&p 500 index , and the stock of our peer group companies , including reinvestment of dividends , for the years ended december 31 , 2010 , 2011 , 2012 , 2013 and 2014 . december 31 , december 31 , december 31 , december 31 , december 31 , december 31 .