pre_text: Operating income in 2019 was $1,203 million, decreasing by $197 million compared to 2018, reflecting normal price pressure, increased unsaturation charges and higher R&D spending, partially offset by higher level of grants and favorable currency effects, net of hedging. Operating income in 2018 was $1,400 million, improved by $395 million compared to 2017, reflecting higher volumes, improved manufacturing efficiencies and product mix and lower restructuring charges, partially offset by unfavorable currency effects, net of hedging, normal price pressure and higher operating expenses.
table: Year Ended December 31,
table: 2019 2018 2017
table: (In millions)
table: Operating income $1,203 $1,400 $1,005
table: As percentage of net revenues 12.6% 14.5% 12.0%
question: Analyse this data from a financial earnings document. What is the increase/ (decrease) in Operating income from 2017 to 2019?