pre_text: On a sequential basis, ADG revenues were up 3.3%, driven by an increase in volumes of approximately 8%, partially offset by a decrease in average selling prices of approximately 5%, mostly attributable to product mix. AMS revenues increased 12.1% driven by Analog and Imaging products. AMS increase was due to an increase of approximately 5% in average selling prices, entirely due to product mix, and to higher volumes of approximately of 7%. MDG revenues increased by 7.9%, mainly driven by Microcontrollers, due to both higher average selling prices of approximately 6%, entirely due to product mix, and higher volumes of approximately 2%. On a year-over-year basis, fourth quarter net revenues increased by 4.0%. ADG revenues decreased 4.5% compared to the year-ago quarter on lower revenues in both Automotive and Power Discrete. The decrease was entirely due to lower average selling prices of approximately 4%, while volumes remained substantially flat. The decrease in average selling prices was a combination of less favorable product mix and lower selling prices. AMS fourth quarter revenues grew 9.9% year-over-year, mainly driven by Analog and Imaging. The increase was entirely due to higher average selling prices of approximately 18%, entirely attributable to product mix,
  partially offset by lower volumes of approximately 8%. MDG fourth quarter revenues increased by 7.6%, mainly driven by Microcontrollers. The increase was due to higher average selling prices of approximately 9%,
  entirely due to improved product mix.
table: Three Months Ended % Variation
table: December 31, 2019 September 29, 2019 December 31, 2018 Sequential Year-Over-Year
table: (Unaudited, in millions)
table: Automotive and Discrete Group (ADG) $924 $894 $967 3.3% (4.5)%
table: Analog, MEMS and Sensors Group (AMS) 1,085 968 988 12.1 9.9
table: Microcontrollers and Digital ICs Group (MDG) 742 688 689 7.9 7.6
table: Others 3 3 4 — —
table: Total consolidated 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 revenues from Analog, MEMS and Sensors Group (AMS) for the period December 31, 2019 and 2018?