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Share-based payment (Tables)
12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Number and Weighted Average Exercise Prices ("WAEP") of, and Movements in Share Options
The following table illustrates the number and weighted average exercise prices (“WAEP”) of, and movements in share options during the year:
 
 
  
Number of
share options
 
  
WAEP
 
  
Number of
share options
 
  
WAEP
 
 
  
31.12.2019
 
  
31.12.201
9
 
  
31.12.2020
 
  
31.12.20
20
 
     
Outstanding at January 1 and December 31
  
 
470,000
 
  
US$
 21.11
 
  
 
470,000
 
  
US$
 21.11
 
   
 
 
        
 
 
      
Exercisable at December 31
  
 
470,000
 
  
US$
21.11
 
  
 
470,000
 
  
US$
21.11
 
   
 
 
        
 
 
      
Fair Value of Share Options and Assumptions
 
Date of grant of options
  
On July 29,
2014
  
Fair value at measurement date (US$)
  
5.70 – 6.74
   
 
Share price (US$)
  
21.11
Exercise price (US$)
  
21.11
Expected volatility (%)
  
47.4
Expected option life (years)
  
3.5 – 5.5
Expected dividends (%)
  
5.81
Risk-free interest rate (%)
  
1.4 – 2.0