Financial report context:
abiomed , inc . and subsidiaries notes to consolidated financial statements 2014 ( continued ) evidence of an arrangement exists , ( 2 ) delivery has occurred or services have been rendered , ( 3 ) the seller 2019s price to the buyer is fixed or determinable , and ( 4 ) collectibility is reasonably assured . further , sab 104 requires that both title and the risks and rewards of ownership be transferred to the buyer before revenue can be recognized . in addition to sab 104 , we follow the guidance of eitf 00-21 , revenue arrangements with multiple deliverables . we derive our revenues primarily from product sales , including maintenance service agreements . the great majority of our product revenues are derived from shipments of our ab5000 and bvs 5000 product lines to fulfill customer orders for a specified number of consoles and/or blood pumps for a specified price . we recognize revenues and record costs related to such sales upon product shipment . maintenance and service support contract revenues are recognized ratably over the term of the service contracts based upon the elapsed term of the service contract . government-sponsored research and development contracts and grants generally provide for payment on a cost-plus-fixed-fee basis . revenues from these contracts and grants are recognized as work is performed , provided the government has appropriated sufficient funds for the work . under contracts in which the company elects to spend significantly more on the development project during the term of the contract than the total contract amount , the company prospectively recognizes revenue on such contracts ratably over the term of the contract as it incurs related research and development costs , provided the government has appropriated sufficient funds for the work . ( d ) translation of foreign currencies all assets and liabilities of the company 2019s non-u.s . subsidiaries are translated at year-end exchange rates , and revenues and expenses are translated at average exchange rates for the year in accordance with sfas no . 52 , foreign currency translation . resulting translation adjustments are reflected in the accumulated other comprehensive loss component of shareholders 2019 equity . currency transaction gains and losses are included in the accompanying statement of income and are not material for the three years presented . ( e ) warranties the company routinely accrues for estimated future warranty costs on its product sales at the time of sale . our products are subject to rigorous regulation and quality standards . warranty costs are included in cost of product revenues within the consolidated statements of operations . the following table summarizes the activities in the warranty reserve for the two fiscal years ended march 31 , 2006 ( in thousands ) .

Financial table:
2005: balance at the beginning of the year; 2006: $ 245; column_3: $ 231
2005: accrual for warranties; 2006: 198; column_3: 193
2005: warranty expense incurred for the year; 2006: -212 ( 212 ); column_3: -257 ( 257 )
2005: balance at the end of the year; 2006: $ 231; column_3: $ 167

Additional report context:
.

Question: what was the percentage change in warranty reserve from 2005 to 2006?
Answer: -28%