item 7 .
management 2019s discussion and analysis of financial condition and results of operations our management 2019s discussion and analysis of financial condition and results of operations ( md&a ) is provided in addition to the accompanying consolidated financial statements and notes to assist readers in understanding our results of operations , financial condition , and cash flows .
md&a is organized as follows : 2022 overview .
discussion of our business and overall analysis of financial and other highlights affecting the company in order to provide context for the remainder of md&a .
2022 critical accounting estimates .
accounting estimates that we believe are most important to understanding the assumptions and judgments incorporated in our reported financial results and forecasts .
2022 results of operations .
an analysis of our financial results comparing 2013 to 2012 and comparing 2012 to 2022 liquidity and capital resources .
an analysis of changes in our balance sheets and cash flows , and discussion of our financial condition and potential sources of liquidity .
2022 fair value of financial instruments .
discussion of the methodologies used in the valuation of our financial instruments .
2022 contractual obligations and off-balance-sheet arrangements .
overview of contractual obligations , contingent liabilities , commitments , and off-balance-sheet arrangements outstanding as of december 28 , 2013 , including expected payment schedule .
the various sections of this md&a contain a number of forward-looking statements that involve a number of risks and uncertainties .
words such as 201canticipates , 201d 201cexpects , 201d 201cintends , 201d 201cplans , 201d 201cbelieves , 201d 201cseeks , 201d 201cestimates , 201d 201ccontinues , 201d 201cmay , 201d 201cwill , 201d 201cshould , 201d and variations of such words and similar expressions are intended to identify such forward-looking statements .
in addition , any statements that refer to projections of our future financial performance , our anticipated growth and trends in our businesses , uncertain events or assumptions , and other characterizations of future events or circumstances are forward-looking statements .
such statements are based on our current expectations and could be affected by the uncertainties and risk factors described throughout this filing and particularly in 201crisk factors 201d in part i , item 1a of this form 10-k .
our actual results may differ materially , and these forward-looking statements do not reflect the potential impact of any divestitures , mergers , acquisitions , or other business combinations that had not been completed as of february 14 , 2014 .
overview our results of operations for each period were as follows: .

Three Months Ended
Twelve Months Ended
(Dollars in Millions, Except Per Share Amounts)
Dec. 28,2013
Sept. 28,2013
Change
Dec. 28,2013
Dec. 29,2012
Change
Net revenue
$13,834
$13,483
$351
$52,708
$53,341
$(633)
Gross margin
$8,571
$8,414
$157
$31,521
$33,151
$(1,630)
Gross margin percentage
62.0%
62.4%
(0.4)%
59.8%
62.1%
(2.3)%
Operating income
$3,549
$3,504
$45
$12,291
$14,638
$(2,347)
Net income
$2,625
$2,950
$(325)
$9,620
$11,005
$(1,385)
Diluted earnings per common share
$0.51
$0.58
$(0.07)
$1.89
$2.13
$(0.24)

revenue for 2013 was down 1% ( 1 % ) from 2012 .
pccg experienced lower platform unit sales in the first half of the year , but saw offsetting growth in the back half as the pc market began to show signs of stabilization .
dcg continued to benefit from the build out of internet cloud computing and the strength of our product portfolio resulting in increased platform volumes for dcg for the year .
higher factory start-up costs for our next-generation 14nm process technology led to a decrease in gross margin compared to 2012 .
in response to the current business environment and to better align resources , management approved several restructuring actions including targeted workforce reductions as well as the exit of certain businesses and facilities .
these actions resulted in restructuring and asset impairment charges of $ 240 million for 2013 .
table of contents .

Question: Analyse this data from a financial earnings document. what was the percentage change in diluted earnings per common share december 29 2012 and december 28 2013?
Choices:
0
-11.26761
-0.11268
0.41658
-8.875
Correct choice index: 2