pre_text: Share-Based Compensation Expense The following table sets forth the total share-based compensation expense included in our consolidated statements of operations (amounts in millions):
table: For the Years Ended December 31,
table: 2019 2018 2017
table: Cost of revenues—product sales: Software royalties, amortization, and intellectual property licenses $19 $13 $10
table: Cost of revenues—subscription, licensing, and other revenues: Game Operations and Distribution Costs 1 2 1
table: Cost of revenues—subscription, licensing, and other revenues: Software royalties, amortization, and intellectual property licenses 1 3 3
table: Product development 53 61 57
table: Sales and marketing 10 15 15
table: General and administrative 82 115 92
table: Share-based compensation expense before income taxes 166 209 178
table: Income tax benefit (29) (46) (34)
table: Total share-based compensation expense, net of income tax benefit $137 $163 $144
question: Analyse this data from a financial earnings document. What was the change in sales and marketing between 2018 and 2019?