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Net Earnings Per Common Share
 12 Months Ended
Dec. 31, 2021
Earnings per share [abstract]  
Net Earnings Per Common Share Net Earnings Per Common Share
 
 
2021

2020

2019
Weighted average common shares outstanding
– basic (thousands of shares)
1,181,250 

1,181,768 

1,190,977 
Effect of dilutive stock options (thousands of shares)
5,307 

— 

2,129 
Weighted average common shares outstanding
– diluted (thousands of shares)
1,186,557 1,181,768 1,193,106 
Net earnings (loss)
$7,664 

$(435)

$5,416 
Net earnings (loss) per common share
– basic
$6.49 

$(0.37)

$4.55 
 
– diluted
$6.46 

$(0.37)

$4.54 
In 2021, the Company excluded 3,496,000 potentially anti-dilutive stock options from the calculation of diluted earnings per common share (year ended December 31, 2020 – 44,117,000; 2019 – 36,834,000).