pre_text: Research and Development The increase in research and development expenses in fiscal 2019 compared to fiscal 2018 was primarily driven by an increase in employee compensation costs caused by increases in headcount, annual compensation and benefit adjustments and employee performance-based compensation, partially offset by a decrease in project material costs.
table: Fiscal Year Ended
table: December 28, 2019 December 29, 2018 $ Change % Change
table: (Dollars in thousands)
table: Research and development $81,499 $74,976 $6,523 8.7 %
table: % of revenues 13.8 % 14.2 %
table: Fiscal Year Ended
table: December 29, 2018 December 30, 2017 $ Change % Change
table: (Dollars in thousands)
table: Research and development $74,976 $73,807 $1,169 1.6 %
table: % of revenues 14.2 % 13.5 %
question: Analyse this data from a financial earnings document. What is the average Research and development for the Fiscal Year Ended December 29, 2018 to December 30, 2017?