Table:
|  |  | Three Months Ended |  | % Variation |  |
| --- | --- | --- | --- | --- | --- |
|  | December 31, 2019 | September 29, 2019 | December 31, 2018 | Sequential | Year-Over-Year |
|  |  |  | (Unaudited, in millions) |  |  |
| EMEA | $538 | $549 | $617 | (2.0)% | (12.8)% |
| Americas | 360 | 326 | 342 | 10.5 | 5.4 |
| Asia Pacific | 1,856 | 1,678 | 1,689 | 10.6 | 9.9 |
| Total | $2,754 | $2,553 | $2,648 | 7.9% | 4.0% |
Paragraphs:
By region of shipment, in the 2019 fourth quarter, Asia Pacific revenues grew sequentially by 10.6%, principally in Imaging, Analog and Microcontrollers, Americas was up by 10.5%, mainly driven by Digital and Power Discrete, and EMEA decreased by 2.0%.
On a year-over-year basis, revenues grew 9.9% in Asia Pacific, mainly due to Analog, Microcontrollers and Imaging. In Americas, revenues grew 5.4%, mainly driven by Digital and Power Discrete, while it decreased by 12.8% in EMEA, mainly due to lower sales in Automotive, Power Discrete and  analog.
Question:
What caused the increase in Asia Pacific revenues in fourth quarter of 2019?
Answer: Imaging, Analog and Microcontrollers, Americas was up by 10.5%, mainly driven by Digital and Power Discrete, and EMEA decreased by 2.0%.