Table:
|  |  | For the Years Ended December 31, |  |
| --- | --- | --- | --- |
|  | 2019 | 2018 | 2017 |
| Cost of revenues—product sales: Software royalties, amortization, and intellectual property licenses | $19 | $13 | $10 |
| Cost of revenues—subscription, licensing, and other revenues: Game Operations and Distribution Costs | 1 | 2 | 1 |
| Cost of revenues—subscription, licensing, and other revenues: Software royalties, amortization, and intellectual property licenses | 1 | 3 | 3 |
| Product development | 53 | 61 | 57 |
| Sales and marketing | 10 | 15 | 15 |
| General and administrative | 82 | 115 | 92 |
| Share-based compensation expense before income taxes | 166 | 209 | 178 |
| Income tax benefit | (29) | (46) | (34) |
| Total share-based compensation expense, net of income tax benefit | $137 | $163 | $144 |
Paragraphs:
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):
Question:
What was the change in product development between 2018 and 2019?
Answer: 53-61 = -8