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: .
[['( dollars in millions except per share amounts )', 'three months ended dec . 282013', 'three months ended sept . 282013', 'three months ended change', 'three months ended dec . 282013', 'three months ended dec . 292012', 'change'], ['net revenue', '$ 13834', '$ 13483', '$ 351', '$ 52708', '$ 53341', '$ -633 ( 633 )'], ['gross margin', '$ 8571', '$ 8414', '$ 157', '$ 31521', '$ 33151', '$ -1630 ( 1630 )'], ['gross margin percentage', '62.0% ( 62.0 % )', '62.4% ( 62.4 % )', '( 0.4 ) % (  % )', '59.8% ( 59.8 % )', '62.1% ( 62.1 % )', '( 2.3 ) % (  % )'], ['operating income', '$ 3549', '$ 3504', '$ 45', '$ 12291', '$ 14638', '$ -2347 ( 2347 )'], ['net income', '$ 2625', '$ 2950', '$ -325 ( 325 )', '$ 9620', '$ 11005', '$ -1385 ( 1385 )'], ['diluted earnings per common share', '$ 0.51', '$ 0.58', '$ -0.07 ( 0.07 )', '$ 1.89', '$ 2.13', '$ -0.24 ( 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: what was the percentage change in diluted earnings per common share december 29 2012 and december 28 2013?
Answer: -11%