equity compensation plan information the plan documents for the plans described in the footnotes below are included as exhibits to this form 10-k , and are incorporated herein by reference in their entirety .the following table provides information as of dec .31 , 2006 regarding the number of shares of ppg common stock that may be issued under ppg 2019s equity compensation plans .plan category securities exercise of outstanding options , warrants and rights weighted- average exercise price of outstanding warrants and rights number of securities remaining available for future issuance under equity compensation ( excluding securities reflected in column ( a ) ) equity compensation plans approved by security holders ( 1 ) 9413216 $ 58.35 10265556 equity compensation plans not approved by security holders ( 2 ) , ( 3 ) 2089300 $ 70.00 2014 .
[['plan category', 'numberof securities to be issued upon exercise of outstanding options warrants and rights ( a )', 'weighted- average exercise price of outstanding options warrants and rights ( b )', 'number of securities remaining available for future issuance under equity compensation plans ( excluding securities reflected in column ( a ) ) ( c )'], ['equity compensation plans approved by security holders ( 1 )', '9413216', '$ 58.35', '10265556'], ['equity compensation plans not approved by security holders ( 2 ) ( 3 )', '2089300', '$ 70.00', '2014'], ['total', '11502516', '$ 60.57', '10265556']]
( 1 ) equity compensation plans approved by security holders include the ppg industries , inc .stock plan , the ppg omnibus plan , the ppg industries , inc .executive officers 2019 long term incentive plan , and the ppg industries inc .long term incentive plan .( 2 ) equity compensation plans not approved by security holders include the ppg industries , inc .challenge 2000 stock plan .this plan is a broad- based stock option plan under which the company granted to substantially all active employees of the company and its majority owned subsidiaries on july 1 , 1998 , the option to purchase 100 shares of the company 2019s common stock at its then fair market value of $ 70.00 per share .options became exercisable on july 1 , 2003 , and expire on june 30 , 2008 .there were 2089300 shares issuable upon exercise of options outstanding under this plan as of dec .31 , 2006 .( 3 ) excluded from the information presented here are common stock equivalents held under the ppg industries , inc .deferred compensation plan , the ppg industries , inc .deferred compensation plan for directors and the ppg industries , inc .directors 2019 common stock plan , none of which are equity compensation plans .as supplemental information , there were 491168 common stock equivalents held under such plans as of dec .31 , 2006 .item 6 .selected financial data the information required by item 6 regarding the selected financial data for the five years ended dec .31 , 2006 is included in exhibit 99.2 filed with this form 10-k and is incorporated herein by reference .this information is also reported in the eleven-year digest on page 72 of the annual report under the captions net sales , income ( loss ) before accounting changes , cumulative effect of accounting changes , net income ( loss ) , earnings ( loss ) per common share before accounting changes , cumulative effect of accounting changes on earnings ( loss ) per common share , earnings ( loss ) per common share , earnings ( loss ) per common share 2013 assuming dilution , dividends per share , total assets and long-term debt for the years 2002 through 2006 .item 7 .management 2019s discussion and analysis of financial condition and results of operations performance in 2006 compared with 2005 performance overview our sales increased 8% ( 8 % ) to $ 11.0 billion in 2006 compared to $ 10.2 billion in 2005 .sales increased 4% ( 4 % ) due to the impact of acquisitions , 2% ( 2 % ) due to increased volumes , and 2% ( 2 % ) due to increased selling prices .cost of sales as a percentage of sales increased slightly to 63.7% ( 63.7 % ) compared to 63.5% ( 63.5 % ) in 2005 .selling , general and administrative expense increased slightly as a percentage of sales to 17.9% ( 17.9 % ) compared to 17.4% ( 17.4 % ) in 2005 .these costs increased primarily due to higher expenses related to store expansions in our architectural coatings operating segment and increased advertising to promote growth in our optical products operating segment .other charges decreased $ 81 million in 2006 .other charges in 2006 included pretax charges of $ 185 million for estimated environmental remediation costs at sites in new jersey and $ 42 million for legal settlements offset in part by pretax earnings of $ 44 million for insurance recoveries related to the marvin legal settlement and to hurricane rita .other charges in 2005 included pretax charges of $ 132 million related to the marvin legal settlement net of related insurance recoveries of $ 18 million , $ 61 million for the federal glass class action antitrust legal settlement , $ 34 million of direct costs related to the impact of hurricanes rita and katrina , $ 27 million for an asset impairment charge in our fine chemicals operating segment and $ 19 million for debt refinancing costs .other earnings increased $ 30 million in 2006 due to higher equity earnings , primarily from our asian fiber glass joint ventures , and higher royalty income .net income and earnings per share 2013 assuming dilution for 2006 were $ 711 million and $ 4.27 , respectively , compared to $ 596 million and $ 3.49 , respectively , for 2005 .net income in 2006 included aftertax charges of $ 106 million , or 64 cents a share , for estimated environmental remediation costs at sites in new jersey and louisiana in the third quarter ; $ 26 million , or 15 cents a share , for legal settlements ; $ 23 million , or 14 cents a share for business restructuring ; $ 17 million , or 10 cents a share , to reflect the net increase in the current value of the company 2019s obligation relating to asbestos claims under the ppg settlement arrangement ; and aftertax earnings of $ 24 million , or 14 cents a share for insurance recoveries .net income in 2005 included aftertax charges of $ 117 million , or 68 cents a share for legal settlements net of insurance ; $ 21 million , or 12 cents a share for direct costs related to the impact of hurricanes katrina and rita ; $ 17 million , or 10 cents a share , related to an asset impairment charge related to our fine chemicals operating segment ; $ 12 million , or 7 cents a share , for debt refinancing cost ; and $ 13 million , or 8 cents a share , to reflect the net increase in the current 2006 ppg annual report and form 10-k 19 4282_txt to be issued options , number of .

Question: what was the change in earnings per share from 2005 to 2006?
Answer: 0.78