Please answer the given financial question based on the context.
Context: shareowner return performance graph the following performance graph and related information shall not be deemed 201csoliciting material 201d or to be 201cfiled 201d with the sec , nor shall such information be incorporated by reference into any future filing under the securities act of 1933 or securities exchange act of 1934 , each as amended , except to the extent that the company specifically incorporates such information by reference into such filing . the following graph shows a five year comparison of cumulative total shareowners 2019 returns for our class b common stock , the standard & poor 2019s 500 index , and the dow jones transportation average . the comparison of the total cumulative return on investment , which is the change in the quarterly stock price plus reinvested dividends for each of the quarterly periods , assumes that $ 100 was invested on december 31 , 2008 in the standard & poor 2019s 500 index , the dow jones transportation average , and our class b common stock. .
||12/31/2008|12/31/2009|12/31/2010|12/31/2011|12/31/2012|12/31/2013|
|united parcel service inc .|$ 100.00|$ 107.75|$ 140.39|$ 145.84|$ 151.44|$ 221.91|
|standard & poor 2019s 500 index|$ 100.00|$ 126.45|$ 145.49|$ 148.55|$ 172.30|$ 228.09|
|dow jones transportation average|$ 100.00|$ 118.59|$ 150.30|$ 150.31|$ 161.56|$ 228.42|
.
Question: what is the difference in performance for the five years ended 12/21/2013 between united parcel service inc . and the standard & poor's 500 index?


Answer: The answer is:-6.18