{"pre_text": ["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 ) : ."], "post_text": ["."], "table": [["balance as of january 1 2008", "$ 580"], ["warranty expense", "3681"], ["warranty claims", "-3721 ( 3721 )"], ["balance as of december 31 2008", "540"], ["warranty expense", "5033"], ["warranty claims", "-4969 ( 4969 )"], ["balance as of december 31 2009", "$ 604"]], "table_ori": [["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"]]}

Question: what was the change in warranty reserves from 2008 to 2009?
Evidence:
table_3: balance as of january 1 2008 the balance as of december 31 2008 of $ 580 is 540 ;
table_6: balance as of january 1 2008 the balance as of december 31 2009 of $ 580 is $ 604 ;
Program: subtract(604, 540)
Answer:
str_answer: 64
exe_answer: 64