Years Ended December, 31
2019
2018
2017
(Dollars in millions, except per share amounts, shares in thousands)
Loss income (Numerator):
Net (loss) income
$(5,269)
(1,733)
1,389
Net (loss) income applicable to common stock for computing basic earnings per common share
(5,269)
(1,733)
1,389
Net (loss) income as adjusted for purposes of computing diluted earnings per common share
$(5,269)
(1,733)
1,389
Shares (Denominator):
Weighted average number of shares:
Outstanding during period
1,088,730
1,078,409
635,576
Non-vested restricted stock
(17,289)
(12,543)
(7,768)
Weighted average shares outstanding for computing basic earnings per common share
1,071,441
1,065,866
627,808
Incremental common shares attributable to dilutive securities:
Shares issuable under convertible securities
—
—
10
Shares issuable under incentive compensation plans
—
—
875
Number of shares as adjusted for purposes of computing diluted (loss) earnings per common share
1,071,441
1,065,866
628,693
Basic (loss) earnings per common share
$(4.92)
(1.63)
2.21
Diluted (loss) earnings per common share(1)
$(4.92)
(1.63)
2.21

text: (13) (Loss) Earnings Per Common Share
text: Basic and diluted (loss) earnings per common share for the years ended December 31, 2019, 2018 and 2017 were calculated as follows:
text: (1) For the year ended December 31, 2019 and December 31, 2018, we excluded from the calculation of diluted loss per share 3.0 million shares and 4.6 million shares, respectively, potentially issuable under incentive compensation plans or convertible securities, as their effect, if included, would have been anti-dilutive.
text: Our calculation of diluted (loss) earnings per common share excludes shares of common stock that are issuable upon exercise of stock options when the exercise price is greater than the average market price of our common stock. We also exclude unvested restricted stock awards that are antidilutive as a result of unrecognized compensation cost. Such shares were 6.8 million, 2.7 million and 4.7 million for 2019, 2018 and 2017, respectively.

Questions:
question: For the Diluted (loss) earnings per common share, what was excluded for the years 2018 and 2019?
answer: we excluded from the calculation of diluted loss per share 3.0 million shares and 4.6 million shares, respectively, potentially issuable under incentive compensation plans or convertible securities, as their effect, if included, would have been anti-dilutive
question: What was excluded as a result of unrecognized compensation cost?
answer: unvested restricted stock awards that are antidilutive
question: In which years were the unvested restricted stock awards that are antidilutive excluded?
answer: 2019
2018
2017
question: In which year was the Number of shares as adjusted for purposes of computing diluted (loss) earnings per common share  the largest?
answer: 2019
derivation: 1,071,441>1,065,866>628,693
question: What is the total amount of unvested restricted stock awards that are antidilutive excluded in 2017, 2018 and 2019?
answer: 14.2
derivation: 6.8+2.7+4.7
scale: million
question: What is the average annual amount of unvested restricted stock awards that are antidilutive excluded in 2017, 2018 and 2019?
answer: 4.73
derivation: (6.8+2.7+4.7)/3
scale: million