on either a straight-line or accelerated basis .
amortization expense for intangibles was approximately $ 4.2 million , $ 4.1 million and $ 4.1 million during the years ended december 31 , 2010 , 2009 and 2008 , respectively .
estimated annual amortization expense of the december 31 , 2010 balance for the years ended december 31 , 2011 through 2015 is approximately $ 4.8 million .
impairment of long-lived assets long-lived assets are reviewed for possible impairment whenever events or circumstances indicate that the carrying amount of such assets may not be recoverable .
if such review indicates that the carrying amount of long- lived assets is not recoverable , the carrying amount of such assets is reduced to fair value .
during the year ended december 31 , 2010 , we recognized impairment charges on certain long-lived assets during the normal course of business of $ 1.3 million .
there were no adjustments to the carrying value of long-lived assets of continuing operations during the years ended december 31 , 2009 or 2008 .
fair value of financial instruments our debt is reflected on the balance sheet at cost .
based on market conditions as of december 31 , 2010 , the fair value of our term loans ( see note 5 , 201clong-term obligations 201d ) reasonably approximated the carrying value of $ 590 million .
at december 31 , 2009 , the fair value of our term loans at $ 570 million was below the carrying value of $ 596 million because our interest rate margins were below the rate available in the market .
we estimated the fair value of our term loans by calculating the upfront cash payment a market participant would require to assume our obligations .
the upfront cash payment , excluding any issuance costs , is the amount that a market participant would be able to lend at december 31 , 2010 and 2009 to an entity with a credit rating similar to ours and achieve sufficient cash inflows to cover the scheduled cash outflows under our term loans .
the carrying amounts of our cash and equivalents , net trade receivables and accounts payable approximate fair value .
we apply the market and income approaches to value our financial assets and liabilities , which include the cash surrender value of life insurance , deferred compensation liabilities and interest rate swaps .
required fair value disclosures are included in note 7 , 201cfair value measurements . 201d product warranties some of our salvage mechanical products are sold with a standard six-month warranty against defects .
additionally , some of our remanufactured engines are sold with a standard three-year warranty against defects .
we record the estimated warranty costs at the time of sale using historical warranty claim information to project future warranty claims activity and related expenses .
the changes in the warranty reserve are as follows ( in thousands ) : .

Balance as of January 1, 2009
$540
Warranty expense
5,033
Warranty claims
(4,969)
Balance as of December 31, 2009
604
Warranty expense
9,351
Warranty claims
(8,882)
Business acquisitions
990
Balance as of December 31, 2010
$2,063

self-insurance reserves we self-insure a portion of employee medical benefits under the terms of our employee health insurance program .
we purchase certain stop-loss insurance to limit our liability exposure .
we also self-insure a portion of .

Question: Analyse this data from a financial earnings document. what was the percentage change in warranty reserve between 2009 and 2010?
Choices:
855
2.41556
2415562.91391
598.41556
355.85366
Correct choice index: 1