Year Ended December 31,
Selected Consolidated Statements of Operations Data:
2019
2018
2017
2016
2015
Total revenue
$529,646
$414,673
$325,887
$263,865
$173,457
Cost of revenue (exclusive of depreciation and amortization)
248,580
160,439
89,708
79,145
36,506
Total costs and expenses
408,693
261,883
180,288
144,054
80,351
Operating profit
120,953
152,790
145,599
119,811
93,106
Total other income (expense), net
(32,105)
(19,276)
(6,931)
4,653
713
Income before income tax expense
88,848
133,514
138,668
124,464
93,819
Income tax expense (benefit)
(7,125)
5,534
—
—
—
Net income
95,973
127,980
138,668
124,464
93,819
Net income attributable to noncontrolling interests
63,993
103,724
N/A
N/A
N/A
Net income attributable to GreenSky, Inc.
31,980
24,256
N/A
N/A
N/A
Earnings per share of Class A common stock(1):
Basic
$0.52
$0.43
N/A
N/A
N/A
Diluted
$0.49
$0.41
N/A
N/A
N/A

text: ITEM 6. SELECTED FINANCIAL DATA (Dollars in thousands, except per share data and unless otherwise indicated)
text: The Selected Consolidated Statements of Operations Data for the years ended December 31, 2019, 2018 and 2017 and the Selected Consolidated Balance Sheet Data as of December 31, 2019 and 2018 were derived from our Consolidated Financial Statements included in Item 8 of this Form 10-K. The Selected Consolidated Statements of Operations Data for the years ended December 31, 2016 and 2015 and the Selected Consolidated Balance Sheet Data as of December 31, 2017 and 2016 were derived from our audited Consolidated Financial Statements not included in this Form 10-K. Our historical results are not necessarily indicative of the results to be expected in the future. You should read the following financial information together with the information under Item 7 "Management's Discussion and Analysis of Financial Condition and Results of Operations" and the Consolidated Financial Statements and related notes included in Item 8.
text: GS Holdings and GSLLC are our predecessors for accounting purposes and, accordingly, amounts prior to the Reorganization Transactions and IPO represent the historical consolidated operations of either GS Holdings or GSLLC and its subsidiaries. The amounts as of December 31, 2019 and 2018 and during the period from May 24, 2018 through December 31, 2019 represent those of consolidated GreenSky, Inc. and its subsidiaries. Prior to the Reorganization Transactions and IPO, GreenSky, Inc. did not engage in any business or other activities except in connection with its formation and initial capitalization. See Note 1 to the Notes to Consolidated Financial Statements in Item 8 for further information on our organization.
text: (1) Basic and diluted earnings per share of Class A common stock are applicable only for the period from May 24, 2018 through December 31, 2019, which is the period following the Reorganization Transactions and IPO. See Note 2 to the Notes to Consolidated Financial Statements in Item 8 for further information.

Questions:
question: Which years does the table provide information for the company's Selected Consolidated Statements of Operations Data?
answer: 2019
2018
2017
2016
question: What was the total revenue in 2015?
answer: 173,457
scale: thousand
question: What was the operating profit in 2017?
answer: 145,599
scale: thousand
question: How many years did Total costs and expenses exceed $200,000 thousand?
answer: 2
derivation: 2019##2018
question: What was the change in the cost of revenue between 2017 and 2018?
answer: 70731
derivation: 160,439-89,708
scale: thousand
question: What was the percentage change in operating profit between 2015 and 2016?
answer: 28.68
derivation: (119,811-93,106)/93,106
scale: percent