human
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 backlog backlog decreased slightly in 2014 compared to 2013 primarily due to lower orders on f-16 and f-22 programs. backlog decreased in 2013 compared to 2012 mainly due to lower orders on f-16, c-5 and c-130 programs, partially offset by higher orders on the f-35 program. trends we expect aeronautics 2019 2015 net sales to be comparable or slightly behind 2014 due to a decline in f-16 deliveries as well as a decline in f-35 development activity, partially offset by an increase in production contracts. operating profit is also expected to decrease in the low single digit range, due primarily to contract mix, resulting in a slight decrease in operating margins between years. information systems & global solutions our is&gs business segment provides advanced technology systems and expertise, integrated information technology solutions and management services across a broad spectrum of applications for civil, defense, intelligence and other government customers. is&gs has a portfolio of many smaller contracts as compared to our other business segments. is&gs has been impacted by the continued downturn in certain federal agencies 2019 information technology budgets and increased re-competition on existing contracts coupled with the fragmentation of large contracts into multiple smaller contracts that are awarded primarily on the basis of price. is&gs 2019 operating results included the following (in millions):.
|  | 2014 | 2013 | 2012 |
| --------- | --------- | --------- | --------- |
| Net sales | $7,788 | $8,367 | $8,846 |
| Operating profit | 699 | 759 | 808 |
| Operating margins | 9.0% | 9.1% | 9.1% |
| Backlog at year-end | $8,700 | $8,300 | $8,700 |
2014 compared to 2013 is&gs 2019 net sales decreased $579 million, or 7% (7%), for 2014 compared to 2013. the decrease was primarily attributable to lower net sales of about $645 million for 2014 due to the wind-down or completion of certain programs, driven by reductions in direct warfighter support (including jieddo and ptds) and defense budgets tied to command and control programs; and approximately $490 million for 2014 due to a decline in volume for various ongoing programs, which reflects lower funding levels and programs impacted by in-theater force reductions. the decreases were partially offset by higher net sales of about $550 million for 2014 due to the start-up of new programs, growth in recently awarded programs and integration of recently acquired companies. .
Please answer the following questions with expressions if necessary.
what was the difference in net sales from 2012 to 2013?
assistant
subtract(8367, 8846)
human
what was the percent change?
assistant
subtract(8367, 8846), divide(#0, 8846)