Table:
|  |  | For the Years Ended December 31, |  |
| --- | --- | --- | --- |
|  | 2019 | 2018 | 2017 |
| Numerator: |  |  |  |
| Consolidated net income | $1,503 | $1,848 | $273 |
| Denominator: |  |  |  |
| Denominator for basic earnings per common share—weighted-average common shares outstanding | 767 | 762 | 754 |
| Effect of dilutive stock options and awards under the treasury stock method | 4 | 9 | 12 |
| Denominator for diluted earnings per common share—weighted-average common shares outstanding plus dilutive common shares under the treasury stock method | 771 | 771 | 766 |
| Basic earnings per common share | $1.96 | $2.43 | $0.36 |
| Diluted earnings per common share | $1.95 | $2.40 | $0.36 |
Paragraphs:
20. Computation of Basic/Diluted Earnings Per Common Share
The following table sets forth the computation of basic and diluted earnings per common share (amounts in millions, except per share data):
The vesting of certain of our employee-related restricted stock units and options is contingent upon the satisfaction of predefined performance measures. The shares underlying these equity awards are included in the weighted-average dilutive common shares only if the performance measures are met as of the end of the reporting period. Additionally, potential common shares are not included in the denominator of the diluted earnings per common share calculation when the inclusion of such shares would be anti-dilutive.
Question:
What was the change in diluted earnings per common share between 2018 and 2019?
Answer: $1.95-$2.40 = -0.45