aeronautics our aeronautics business segment is engaged in the research , design , development , manufacture , integration , sustainment , support , and upgrade of advanced military aircraft , including combat and air mobility aircraft , unmanned air vehicles , and related technologies .
aeronautics 2019 major programs include the f-35 lightning ii joint strike fighter , c-130 hercules , f-16 fighting falcon , f-22 raptor , and the c-5m super galaxy .
aeronautics 2019 operating results included the following ( in millions ) : .

2013
2012
2011
Net sales
$14,123
$14,953
$14,362
Operating profit
1,612
1,699
1,630
Operating margins
11.4%
11.4%
11.3%
Backlog at year-end
28,000
30,100
30,500

2013 compared to 2012 aeronautics 2019 net sales for 2013 decreased $ 830 million , or 6% ( 6 % ) , compared to 2012 .
the decrease was primarily attributable to lower net sales of approximately $ 530 million for the f-16 program due to fewer aircraft deliveries ( 13 aircraft delivered in 2013 compared to 37 delivered in 2012 ) partially offset by aircraft configuration mix ; about $ 385 million for the c-130 program due to fewer aircraft deliveries ( 25 aircraft delivered in 2013 compared to 34 in 2012 ) partially offset by increased sustainment activities ; approximately $ 255 million for the f-22 program , which includes about $ 205 million due to decreased production volume as final aircraft deliveries were completed during the second quarter of 2012 and $ 50 million from the favorable resolution of a contractual matter during the second quarter of 2012 ; and about $ 270 million for various other programs ( primarily sustainment activities ) due to decreased volume .
the decreases were partially offset by higher net sales of about $ 295 million for f-35 production contracts due to increased production volume and risk retirements ; approximately $ 245 million for the c-5 program due to increased aircraft deliveries ( six aircraft delivered in 2013 compared to four in 2012 ) and other modernization activities ; and about $ 70 million for the f-35 development contract due to increased volume .
aeronautics 2019 operating profit for 2013 decreased $ 87 million , or 5% ( 5 % ) , compared to 2012 .
the decrease was primarily attributable to lower operating profit of about $ 85 million for the f-22 program , which includes approximately $ 50 million from the favorable resolution of a contractual matter in the second quarter of 2012 and about $ 35 million due to decreased risk retirements and production volume ; approximately $ 70 million for the c-130 program due to lower risk retirements and fewer deliveries partially offset by increased sustainment activities ; about $ 65 million for the c-5 program due to the inception-to-date effect of reducing the profit booking rate in the third quarter of 2013 and lower risk retirements ; approximately $ 35 million for the f-16 program due to fewer aircraft deliveries partially offset by increased sustainment activity and aircraft configuration mix .
the decreases were partially offset by higher operating profit of approximately $ 180 million for f-35 production contracts due to increased risk retirements and volume .
operating profit was comparable for the f-35 development contract and included adjustments of approximately $ 85 million to reflect the inception-to-date impacts of the downward revisions to the profit booking rate in both 2013 and 2012 .
adjustments not related to volume , including net profit booking rate adjustments and other matters , were approximately $ 75 million lower for 2013 compared to 2012 compared to 2011 aeronautics 2019 net sales for 2012 increased $ 591 million , or 4% ( 4 % ) , compared to 2011 .
the increase was attributable to higher net sales of approximately $ 745 million from f-35 production contracts principally due to increased production volume ; about $ 285 million from f-16 programs primarily due to higher aircraft deliveries ( 37 f-16 aircraft delivered in 2012 compared to 22 in 2011 ) partially offset by lower volume on sustainment activities due to the completion of modification programs for certain international customers ; and approximately $ 140 million from c-5 programs due to higher aircraft deliveries ( four c-5m aircraft delivered in 2012 compared to two in 2011 ) .
partially offsetting the increases were lower net sales of approximately $ 365 million from decreased production volume and lower risk retirements on the f-22 program as final aircraft deliveries were completed in the second quarter of 2012 ; approximately $ 110 million from the f-35 development contract primarily due to the inception-to-date effect of reducing the profit booking rate in the second quarter of 2012 and to a lesser extent lower volume ; and about $ 95 million from a decrease in volume on other sustainment activities partially offset by various other aeronautics programs due to higher volume .
net sales for c-130 programs were comparable to 2011 as a decline in sustainment activities largely was offset by increased aircraft deliveries. .

Question: Analyse this data from a financial earnings document. as part of the total decrease of aeronautics 2019 net sales for 2013 what was the percent of the potential factor based on the lower sales of
Choices:
0.63855
40.76923
1.56604
1360
33.125
Correct choice index: 0