Year Ended December 31,

2019

2018

2017

Basic:

Weighted average common shares outstanding

15,270,154

15,224,886

15,189,920

Net income attributable to common stockholders of National Healthcare Corporation

$

68,211

$

58,964

$

56,205

Earnings per common share, basic

$

4.47

$

3.87

$

3.70

Diluted:

Weighted average common shares outstanding

15,270,154

15,224,886

15,189,920

Dilutive effect of stock options

89,892

11,940

29,042

Assumed average common shares outstanding

15,360,046

15,236,826

15,218,962

Net income attributable to common stockholders of National Healthcare Corporation

$

68,211

$

58,964

$

56,205

Earnings per common share, diluted

$

4.44

$

3.87

$

3.69