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EARNINGS PER SHARE | 12 Months Ended
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Dec. 31, 2020
EARNINGS PER SHARE |
EARNINGS PER SHARE | 19. EARNINGS PER SHARE The following table sets forth the computation of basic and diluted earnings per share for the years indicated: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2018 |  | 2019 |  | 2020
​ | ​ | (In Thousands of U.S. Dollars, except share and per share data)
Numerator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income attributable to Canadian Solar Inc. — basic | ​ | $ | 237,070 | ​ | $ | 171,585 | ​ | $ | 146,703
Dilutive effect of interest expense of convertible notes | ​ | ​ | 4,683 | ​ | ​ | 975 | ​ | ​ | 1,518
Net income attributable to Canadian Solar Inc. — diluted | ​ | $ | 241,753 | ​ | $ | 172,560 | ​ | $ | 148,221
Denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Denominator for basic calculation — weighted average number of common shares — basic | ​ |  | 58,914,540 | ​ |  | 59,633,855 | ​ |  | 59,575,898
Diluted effects of share number from share options and RSUs | ​ |  | 543,797 | ​ |  | 794,526 | ​ |  | 897,258
Dilutive effects of share number from convertible notes | ​ | ​ | 2,833,333 | ​ | ​ | 349,315 | ​ | ​ | 1,833,663
Denominator for diluted calculation — weighted average number of common shares — diluted | ​ |  | 62,291,670 | ​ |  | 60,777,696 | ​ |  | 62,306,819
Basic earnings per share | ​ | $ | 4.02 | ​ | $ | 2.88 | ​ | $ | 2.46
Diluted earnings per share | ​ | $ | 3.88 | ​ | $ | 2.83 | ​ | $ | 2.38
​ The following table sets forth anti-dilutive shares excluded from the computation of diluted earnings per share for the years indicated. ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2018 |  | 2019 |  | 2020
Share options and RSUs | ​ | 276,618 |  | 41,950 |  | 187,083
​

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