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Earnings per share
12 Months Ended
Dec. 31, 2018
Disclosure Of Earnings per share [Line Items]  
Disclosure of earnings per share [text block]
20.
Earnings per share
 
Basic and diluted earnings per share are calculated by dividing earnings by the weighted-average number of outstanding shares during the period. Basic and diluted earnings per common share have been determined as follows:
 
 
 
For the year ended

December 31, 2018
 
 
For the year ended

December 31, 2017
 
 
For the year ended
December 31, 2016
 
 
 
US$
 
 
US$
 
 
US$
 
 
 
 
 
 
 
 
 
 
 
Profit for the period (US$)
 
 
119,710,000
 
 
 
349,881,000
 
 
 
340,907,000
 
Weighted average number of share outstanding (Note 12(a))
 
 
350,056,012
 
 
 
350,056,012
 
 
 
350,056,012
 
Basic and diluted earnings per share (US$)
 
 
0.342
 
 
 
1.000
 
 
 
0.974