What is the increase/ (decrease) in net revenues for year ended December 31, from 2018 to 2019?
{"": {"2019": "(In millions, except per share amounts)", "2018": "", "December 31, 2019": "", "September 29, 2019": "(Unaudited, in millions, except per share amounts)", "December 31, 2018": ""}, "Net revenues": {"2019": 9556, "2018": 9664, "December 31, 2019": 2754, "September 29, 2019": 2553, "December 31, 2018": 2648}, "Gross profit": {"2019": 3696, "2018": 3861, "December 31, 2019": 1081, "September 29, 2019": 967, "December 31, 2018": 1059}, "Gross margin as percentage of net revenues.": {"2019": 38.7, "2018": 40.0, "December 31, 2019": 39.3, "September 29, 2019": 37.9, "December 31, 2018": 40.0}, "Operating income": {"2019": 1203, "2018": 1400, "December 31, 2019": 460, "September 29, 2019": 336, "December 31, 2018": 443}, "Net income attributable to parent company": {"2019": 1032, "2018": 1287, "December 31, 2019": 392, "September 29, 2019": 302, "December 31, 2018": 418}, "Diluted earnings per share": {"2019": 1.14, "2018": 1.41, "December 31, 2019": 0.43, "September 29, 2019": 0.34, "December 31, 2018": 0.46}}
net_revenues_2019 = df["Net revenues"]["2019"]
net_revenues_2018 = df["Net revenues"]["2018"]
answer = net_revenues_2019 - net_revenues_2018