pre_text: Fourth quarter gross profit was $1,081 million and gross margin was 39.3%. On a sequential basis, gross margin increased 140 basis points, mainly driven by improved product mix and better manufacturing efficiencies. Gross margin decreased 70 basis points year-over-year, mainly impacted by price pressure and unsaturation charges, partially offset by improved manufacturing efficiencies, better product mix and favorable currency effects, net of hedging.
table: Three Months Ended Variation
table: December 31, 2019 September 29, 2018 December 31, 2018 Sequential Year-Over-Year
table: (Unaudited, in millions)
table: Gross profit $ 1,081 $ 967 $ 1,059 11.8% 2.0%
table: Gross margin (as percentage of net revenues) 39.3% 37.9% 40.0% +140 bps -70 bps
question: Analyse this data from a financial earnings document. What is the average Gross profit for the period December 31, 2019 and 2018?