Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.

Text: marathon oil corporation notes to consolidated financial statements ( g ) this obligation relates to a lease of equipment at united states steel 2019s clairton works cokemaking facility in pennsylvania . we are the primary obligor under this lease . under the financial matters agreement , united states steel has assumed responsibility for all obligations under this lease . this lease is an amortizing financing with a final maturity of 2012 . ( h ) these notes are senior secured notes of marathon oil canada corporation . the notes are secured by substantially all of marathon oil canada corporation 2019s assets . in january 2008 , we provided a full and unconditional guarantee covering the payment of all principal and interest due under the senior notes . ( i ) these obligations as of december 31 , 2009 include $ 36 million related to assets under construction at that date for which a capital lease will commence upon completion of construction . the amounts currently reported are based upon the percent of construction completed as of december 31 , 2009 and therefore do not reflect future minimum lease obligations of $ 164 million related to the asset . ( j ) payments of long-term debt for the years 2010 - 2014 are $ 102 million , $ 246 million , $ 1492 million , $ 287 million and $ 802 million . united steel is due to pay $ 17 million in 2010 , $ 161 million in 2011 , $ 19 million in 2012 , and $ 11 for year 2014 . ( k ) in the event of a change in control , as defined in the related agreements , debt obligations totaling $ 662 million at december 31 , 2009 , may be declared immediately due and payable . ( l ) see note 16 for information on interest rate swaps . 20 . asset retirement obligations the following summarizes the changes in asset retirement obligations : ( in millions ) 2009 2008 . <table class='wikitable'><tr><td>1</td><td>( in millions )</td><td>2009</td><td>2008</td></tr><tr><td>2</td><td>asset retirement obligations as of january 1</td><td>$ 965</td><td>$ 1134</td></tr><tr><td>3</td><td>liabilities incurred including acquisitions</td><td>14</td><td>30</td></tr><tr><td>4</td><td>liabilities settled</td><td>-65 ( 65 )</td><td>-94 ( 94 )</td></tr><tr><td>5</td><td>accretion expense ( included in depreciation depletion and amortization )</td><td>64</td><td>66</td></tr><tr><td>6</td><td>revisions to previous estimates</td><td>124</td><td>24</td></tr><tr><td>7</td><td>held for sale</td><td>-</td><td>-195 ( 195 )</td></tr><tr><td>8</td><td>asset retirement obligations as of december 31 ( a )</td><td>$ 1102</td><td>$ 965</td></tr></table> asset retirement obligations as of december 31 ( a ) $ 1102 $ 965 ( a ) includes asset retirement obligation of $ 3 and $ 2 million classified as short-term at december 31 , 2009 , and 2008. .
Question: what was the net difference in asset retirement obligations between 2008 and 2009?
Answer: 137.0
Question: what was the percent change?

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