Basic earnings per share is calculated by dividing the profit for the year attributable to ordinary equity holders of the company by the weighted average number of ordinary shares outstanding during the year.

Diluted earnings per share is calculated by dividing the profit attributable to ordinary equity holders of the company by the weighted average number of ordinary shares outstanding during the year plus the weighted average number of ordinary shares that would be issued on conversion of all the dilutive potential ordinary shares into ordinary shares.

Basic earnings per share

The calculation of basic earnings per share is based on:


	31.12.2019		31.12.2020		31.12.2021		31.12.2021
	RMB’000		RMB’000		RMB’000		US$’000
Profit attributable to ordinary equity holders of the company		604,914		548,903		272,673		43,129

Weighted average number of ordinary shares		40,858,290		40,858,290		40,858,290		40,858,290

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:


	31.12.2019		31.12.2020		31.12.2021
Weighted average number of shares issued, used in the calculation of basic earnings per share		40,858,290		40,858,290		40,858,290
Diluted effect of share options		—		—		—

Weighted average number of ordinary shares adjusted for effect of dilution		40,858,290		40,858,290		40,858,290

In 2021, 270,000 (2020: 470,000; 2019: 470,000) share options granted to employees under the existing employee share option plan have not been included in the calculation of diluted earnings per share because they are anti-dilutive.

There have been no other transactions involving ordinary shares or potential ordinary share since the reporting date and before the completion of these financial statements.