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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Earnings Per Share | The calculation of basic earnings per share is based on:
|  | 31.12.2015 |  |  | 31.12.2016 |  |  | 31.12.2017 |  |  | 31.12.2017 |
|  | RMB’000 |  |  | RMB’000 |  |  | RMB’000 |  |  | US$’000 |
Profit attributable to ordinary equity holders of the parent |  |  | 341,108 |  |  |  | 515,737 |  |  |  | 953,922 |  |  |  | 150,713 |
Weighted average number of ordinary shares |  |  | 38,712,282 |  |  |  | 40,016,808 |  |  |  | 40,764,569 |  |  |  | 40,764,569 |
Diluted earnings per share The weighted average number of ordinary shares adjusted for the effect of unissued ordinary shares under the Share Option Scheme is determined as follows:
|  | 31.12.2015 |  |  | 31.12.2016 |  |  | 31.12.2017 |
Weighted average number of shares issued, used in the calculation of basic earnings per share |  |  | 38,712,282 |  |  |  | 40,016,808 |  |  |  | 40,764,569 |
Diluted effect of share options |  |  | — |  |  |  | — |  |  |  | — |
Weighted average number of ordinary shares adjusted for effect of dilution |  |  | 38,712,282 |  |  |  | 40,016,808 |  |  |  | 40,764,569 |

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- Definition The disclosure of earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2016-01-13 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2016-03-30&anchor=para_66&doctype=Standard -URIDate 2016-03-31 + Details
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