pre_text: 2 0 0 8 a n n u a l r e p o r t stock performance graph the following graph sets forth the performance of our series a common , series b common stock , and series c common stock for the period september 18 , 2008 through december 31 , 2008 as compared with the performance of the standard and poor 2019s 500 index and a peer group index which consists of the walt disney company , time warner inc. , cbs corporation class b common stock , viacom , inc . class b common stock , news corporation class a common stock , and scripps network interactive , inc . the graph assumes $ 100 originally invested on september 18 , 2006 and that all subsequent dividends were reinvested in additional shares . september 18 , september 30 , december 31 , 2008 2008 2008 .
post_text: s&p 500 peer group .
table: September 18,   2008 September 30,   2008 December 31,   2008
table: DISCA $100.00 $103.19 $102.53
table: DISCB $100.00 $105.54 $78.53
table: DISCK $100.00 $88.50 $83.69
table: S&P 500 $100.00 $96.54 $74.86
table: Peer Group $100.00 $92.67 $68.79
question: Analyse this data from a financial earnings document. what was the percentage cumulative total shareholder return on discb common stock from september 18 , 2008 to december 31 , 2008?