pre_text: The 2019 operating expenses increased 3.9% compared to the prior year, mainly due to salary dynamic, increased spending in certain R&D programs and higher share-based compensation cost, partially offset by favorable currency effects, net of hedging. The 2018 operating expenses increased 9.5% compared to the prior year, mainly due to unfavorable currency effects, net of hedging, salary dynamic, increased R&D activities and higher costs of the share-based compensation plans. The R&D expenses were net of research tax credits in France and Italy, which amounted to $126 million in 2019, $138 million in 2018 and $124 million in 2017.
table: Year Ended December 31, Year Ended December 31, Year Ended December 31, Variation Variation
table: 2019 2018 2017 2019 vs 2018 2018 vs 2017
table: (In millions) (In millions) (In millions)
table: Selling, general and administrative expenses $(1,093) $(1,095) $(981) 0.3% (11.7)%
table: Research and development expenses (1,498) (1,398) (1,296) (7.1) (7.9)
table: Total operating expenses $(2,591) $(2,493) $(2,277) (3.9)% (9.5)%
table: As percentage of net revenues (27.1)% (25.8)% (27.3)% -130 bps +150 bps
question: Analyse this data from a financial earnings document. What is the average Selling, general and administrative expenses?