Table:
|  |  | Year ended December 31, |  |
| --- | --- | --- | --- |
|  | 2019 | 2018 | 2017 |
| Revenues | $1,177.2 | $1,114.0 | $1,051.6 |
| Expenses: |  |  |  |
| Operating expenses | 646.0 | 625.4 | 569.5 |
| Depreciation and amortization | 236.2 | 217.0 | 206.5 |
| Transition and integration costs | 5.4 | 6.6 | 13.1 |
| Total expenses | 887.6 | 849.0 | 789.1 |
| Operating income | 289.6 | 265.0 | 262.5 |
| Operating margin | 24.6% | 23.8% | 25.0% |
| Interest expense, net | (63.5) | (51.7) | (57.5) |
| Other expense, net | (1.4) | (7.1) | (12.6) |
| Earnings before income taxes and equity in losses of unconsolidated affiliates | 224.7 | 206.2 | 192.4 |
| Income tax expense (benefit) | 41.9 | 37.7 | (61.8) |
| Earnings before equity in losses of unconsolidated affiliates | 182.8 | 168.5 | 254.2 |
| Equity in losses of unconsolidated affiliates, net of tax | (74.0) | — | — |
| Net earnings | $108.8 | $168.5 | $254.2 |
| Earnings per share: |  |  |  |
| Net earnings per share attributable to Black Knight common shareholders: |  |  |  |
| Diluted | $0.73 | $1.14 | $1.47 |
| Weighted average shares of common stock outstanding: |  |  |  |
| Diluted | 148.6 | 148.2 | 152.4 |
Paragraphs:
Results of Operations
Consolidated Results of Operations
The following tables present certain financial data for the periods indicated (dollars in millions):
Question:
What was the change in operating income between 2017 and 2018?
Answer: 265.0-262.5 = 2.5