investments prior to our acquisition of keystone on october 12 , 2007 , we held common shares of keystone , which were classified as an available-for-sale investment security .
accordingly , the investment was included in other assets at its fair value , with the unrealized gain excluded from earnings and included in accumulated other comprehensive income , net of applicable taxes .
upon our acquisition of keystone on october 12 , 2007 , the unrealized gain was removed from accumulated other comprehensive income , net of applicable taxes , and the original cost of the common shares was considered a component of the purchase price .
fair value of financial instruments our debt is reflected on the balance sheet at cost .
based on current market conditions , our interest rate margins are below the rate available in the market , which causes the fair value of our debt to fall below the carrying value .
the fair value of our term loans ( see note 6 , 201clong-term obligations 201d ) is approximately $ 570 million at december 31 , 2009 , as compared to the carrying value of $ 596 million .
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 , 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 approach to value our financial assets and liabilities , which include the cash surrender value of life insurance , deferred compensation liabilities and interest rate swaps .
the market approach utilizes available market information to estimate fair value .
required fair value disclosures are included in note 8 , 201cfair value measurements . 201d accrued expenses 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 our property and casualty risk , which includes automobile liability , general liability , workers 2019 compensation and property under deductible insurance programs .
the insurance premium costs are expensed over the contract periods .
a reserve for liabilities associated with these losses is established for claims filed and claims incurred but not yet reported based upon our estimate of ultimate cost , which is calculated using analyses of historical data .
we monitor new claims and claim development as well as trends related to the claims incurred but not reported in order to assess the adequacy of our insurance reserves .
self-insurance reserves on the consolidated balance sheets are net of claims deposits of $ 0.7 million and $ 0.8 million , at december 31 , 2009 and 2008 , respectively .
while we do not expect the amounts ultimately paid to differ significantly from our estimates , our insurance reserves and corresponding expenses could be affected if future claim experience differs significantly from historical trends and assumptions .
product warranties some of our mechanical products are sold with a standard six-month 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, 2008
$580
Warranty expense
3,681
Warranty claims
(3,721)
Balance as of December 31, 2008
540
Warranty expense
5,033
Warranty claims
(4,969)
Balance as of December 31, 2009
$604

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Question: Analyse this data from a financial earnings document. what was the change in warranty reserves from 2008 to 2009?
Choices:
-539
64.0
584
38656
-64
Correct choice index: 1