pre_text: Our fourth quarter 2019 net revenues amounted to $2,754 million, registering a sequential increase of 7.9%, 290 basis points above the mid-point of our guidance, with all product groups contributing to the growth. The sequential increase resulted from higher volumes of approximately 7% and an increase of approximately 1% in average selling prices, the latter entirely due to product mix, while selling prices remained substantially stable. On a year-over-year basis, our net revenues increased by 4.0%. This increase was entirely due to an increase of approximately 6% in average selling prices, partially offset by an approximate 2% decrease in volumes. The average selling prices increase was entirely driven by improved product mix of approximately 9%, partially offset by lower selling prices of approximately 3%.
table: Three Months Ended Three Months Ended Three Months Ended % Variation % Variation
table: December 31, 2019 September 29, 2019 December 31, 2018 Sequential Year- Over- Year
table: (Unaudited, in millions)
table: Net sales $ 2,750 $ 2,547 $ 2,633 8.0% 4.5%
table: Other revenues 4 6 15 (45.0) (77.4)
table: Net revenues $ 2,754 $ 2,553 $ 2,648 7.9% 4.0%
question: Analyse this data from a financial earnings document. What is the average Net sales for the period December 31, 2019 and 2018?