For the year ended December 31,
2017
2018
2019
Basic earnings/(loss) per share
Profit/(loss) for the year attributable to owners of the Group
15,506
47,683
(100,661)
Less: Dividends on Preference Shares
(10,064)
(10,063)
(10,063)
Profit/(loss) for the year available to owners of the Group
5,442
37,620
(110,724)
Weighted average number of shares outstanding, basic
80,622,788
80,792,837
80,849,818
Basic earnings/(loss) per share
0.07
0.47
(1.37)
Diluted earnings/(loss) per share
Profit/(loss) for the year available to owners of the Group used in the calculation of diluted EPS
5,442
37,620
(110,724)
Weighted average number of shares outstanding, basic
80,622,788
80,792,837
80,849,818
Dilutive potential ordinary shares
643,342
844,185
—
Weighted average number of shares used in the calculation of diluted EPS
81,266,130
81,637,022
80,849,818
Diluted earnings/(loss) per share
0.07
0.46
(1.37)

text: GasLog Ltd. and its Subsidiaries
Notes to the consolidated financial statements (Continued)
For the years ended December 31, 2017, 2018 and 2019
(All amounts expressed in thousands of U.S. Dollars, except share and per share data)
text: 29. Earnings/(losses) per share (‘‘EPS’’)
text: Basic earnings/(losses) per share was calculated by dividing the profit/(loss) for the year attributable to the owners of the common shares after deducting the dividend on Preference Shares by the weighted average number of common shares issued and outstanding during the year.
text: Diluted EPS is calculated by dividing the profit/(loss) for the year attributable to the owners of the Group adjusted for the effects of all dilutive potential ordinary shares by the weighted average number of all potential ordinary shares assumed to have been converted into common shares, unless such potential ordinary shares have an antidilutive effect.
text: The following reflects the earnings/(losses) and share data used in the basic and diluted earnings/ (losses) per share computations:
text: The Group excluded the effect of 2,630,173 SARs and 367,162 RSUs in calculating diluted EPS for the year ended December 31, 2019, as they were anti-dilutive (December 31, 2018: 555,453 SARs and 0 RSUs, December 31, 2017: 998,502 SARs and 0 RSUs).

Questions:
question: How was basic earnings/(losses) per share calculated?
answer: By dividing the profit/(loss) for the year attributable to the owners of the common shares after deducting the dividend on Preference Shares by the weighted average number of common shares issued and outstanding during the year.
question: In which years was the earnings/(losses) per share recorded for?
answer: 2017
2018
2019
question: How was diluted EPS calculated?
answer: Diluted EPS is calculated by dividing the profit/(loss) for the year attributable to the owners of the Group adjusted for the effects of all dilutive potential ordinary shares by the weighted average number of all potential ordinary shares assumed to have been converted into common shares, unless such potential ordinary shares have an antidilutive effect.
question: Which year was the basic earnings per share the highest?
answer: 2018
derivation: 0.47 > 0.07 > (1.37)
question: What was the change in basic EPS from 2018 to 2019?
answer: -1.84
derivation: (1.37) - 0.47 
question: What was the percentage change in diluted EPS from 2017 to 2018?
answer: 557.14
derivation: (0.46 - 0.07)/0.07 
scale: percent