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