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Earnings per share | 12 Months Ended
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Dec. 31, 2019
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Earnings per share | 19 Earnings per share Basic earnings per share Basic earnings per share is calculated by dividing the net income attributable to owners, after deduction of coupons on perpetual securities and non-cumulative subordinated notes by the weighted average number of common shares, excluding common shares purchased by the Company and held as treasury shares (refer to note 30.1 Share capital – par value and 30.3 Treasury shares respectively).
|  | 2019 |  |  | 2018 |  |  | 2017 |
Net income / (loss) attributable to owners |  |  | 1,239 |  |  |  | 710 |  |  |  | 2,469 |
Coupons on perpetual securities |  |  | (88) |  |  |  | (102 | ) |  |  | (103 | )
Coupons on non-cumulative subordinated notes |  |  | - |  |  |  | (11 | ) |  |  | (28 | )
Net income / (loss) attributable to owners for basic earnings per share calculation |  |  | 1,151 |  |  |  | 597 |  |  |  | 2,338 |
Net income / (loss) attributable to common shareholders |  |  | 1,143 |  |  |  | 593 |  |  |  | 2,321 |
Net income / (loss) attributable to common shareholders B |  |  | 8 |  |  |  | 4 |  |  |  | 16 |
Weighted average number of common shares outstanding (in million) |  |  | 2,042 |  |  |  | 2,036 |  |  |  | 2,042 |
Weighted average number of common shares B outstanding (in million) |  |  | 572 |  |  |  | 571 |  |  |  | 575 |
Basic earnings per common share (EUR per share) |  |  | 0.56 |  |  |  | 0.29 |  |  |  | 1.14 |
Basic earnings per common share B (EUR per share) |  |  | 0.01 |  |  |  | 0.01 |  |  |  | 0.03 |
Diluted earnings per share The diluted earnings per share equaled the basic earnings per share for all years disclosed since there were no Long Term Incentive Plans which were considered dilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2019-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&doctype=Standard&dita_xref=IAS33_g70-73A_TI -URIDate 2019-03-27 + Details
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