pre_text: The following is a reconciliation of the beginning and ending amounts of unrecognized income tax benefits (in thousands): The amount of unrecognized tax benefits that, if recognized, would impact the effective tax rate is $ 1.5 million and $4.6 million for the fiscal years ended September 28, 2019 and September 29, 2018, respectively. The Company recognizes accrued interest and penalties related to unrecognized tax benefits in income tax expense. The total accrued penalties and net accrued interest with respect to income taxes was approximately $0.2 million for each of the fiscal years ended September 28, 2019, September 29, 2018 and September 30, 2017. The Company recognized less than $0.1 million of expense for accrued penalties and net accrued interest in the Consolidated Statements of Comprehensive Income for each of the fiscal years ended September 28, 2019, September 29, 2018 and September 30, 2017.
table: 2019 2018 2017
table: Balance at beginning of fiscal year  $5,841 $3,115 $2,799
table: Gross increases for tax positions of prior years 62 21 184
table: Gross increases for tax positions of the current year 39 2,893 163
table: Gross decreases for tax positions of prior years  (3,672) (188) (31)
table: Balance at end of fiscal year 2,270 5,841 3,115
question: Analyse this data from a financial earnings document. What was the change in the Gross increases for tax positions of prior years between 2018 and 2019?