pre_text: NOTE 14. PROVISION FOR WARRANTY The changes in the amount of provision for warranty are as follows: Costs of warranty include the cost of labor and materials to repair a product during the warranty period. The main term of the warranty period is one year. The Company accrues for the estimated cost of the warranty on its products shipped in the provision for warranty, upon recognition of the sale of the product. The costs are estimated based on actual historical expenses incurred and on estimated future expenses related to current sales, and are updated periodically. Actual warranty costs are charged against the provision for warranty.
table: December 31,
table: 2018 2019
table: Balance January 1 6,562 7,955
table: Charged to cost of sales 18,408 26,301
table: Deductions (8,985) (12,232)
table: Releases of expired warranty (8,214) (5,684)
table: Foreign currency translation effect 184 84
table: Balance December 31 7,955 16,424
question: Analyse this data from a financial earnings document. What is the change in balance at start of year from 2018 to 2019?