pre_text: Consolidated Statements of Operations Data The following table sets forth consolidated statements of operations data for the periods indicated (amounts in millions) and as a percentage of total net revenues, except for cost of revenues, which are presented as a percentage of associated revenues: (1) During the three months ended March 31, 2019, we identified an amount which should have been recorded in the three months and year ended December 31, 2018 to reduce income tax expense by $35 million. Our statement of operations for the year ended December 31, 2018, as presented above, has been revised to reflect the correction. See further discussion in Note 2 of the notes to the consolidated financial statements included in Item 8 of this Annual Report on Form 10-K. (2) Represents the loss on extinguishment of debt we recognized in connection with our debt financing activities during the year ended December 31, 2018. The loss on extinguishment is comprised of a $25 million premium payment and a $15 million write-off of unamortized discount and deferred financing costs.
table: For the Years Ended December 31,
table: 2019 2018(1)
table: Net revenues
table: Product sales $1,975 30% $2,255 30%
table: Subscription, licensing, and other revenues 4,514 70 5,245 70
table: Total net revenues 6,489 100 7,500 100
table: Costs and expenses
table: Cost of revenues—product sales:
table: Product costs 656 33 719 32
table: Software royalties, amortization, and intellectual property licenses 240 12 371 16
table: Cost of revenues—subscription, licensing, and other
table: Game operations and distribution costs 965 21 1,028 20
table: Software royalties, amortization, and intellectual property licenses 233 5 399 8
table: Product development 998 15 1,101 15
table: Sales and marketing 926 14 1,062 14
table: General and administrative 732 11 822 11
table: Restructuring and related costs 132 2 10 —
table: Total costs and expenses 4,882 75 5,512 73
table: Operating income 1,607 25 1,988 27
table: Interest and other expense (income), net (26) — 71 1
table: Loss on extinguishment of debt (2) — — 40 1
table: Income before income tax expense 1,633 25 1,877 25
table: Income tax expense 130 2 29 —
table: Net income $1,503 23% $1,848 25%
question: Analyse this data from a financial earnings document. What is the difference in game operations and distribution costs between 2018 and 2019?