{"pre_text": ["f0b7 financial expectations 2013 we are cautious about the economic environment , but , assuming that industrial production grows approximately 3% ( 3 % ) as projected , volume should exceed 2013 levels .", "even with no volume growth , we expect earnings to exceed 2013 earnings , generated by core pricing gains , on-going network improvements and productivity initiatives .", "we expect that free cash flow for 2014 will be lower than 2013 as higher cash from operations will be more than offset by additional cash of approximately $ 400 million that will be used to pay income taxes that were previously deferred through bonus depreciation , increased capital spend and higher dividend payments .", "results of operations operating revenues millions 2013 2012 2011 % (  % ) change 2013 v 2012 % (  % ) change 2012 v 2011 ."], "post_text": ["we generate freight revenues by transporting freight or other materials from our six commodity groups .", "freight revenues vary with volume ( carloads ) and arc .", "changes in price , traffic mix and fuel surcharges drive arc .", "we provide some of our customers with contractual incentives for meeting or exceeding specified cumulative volumes or shipping to and from specific locations , which we record as reductions to freight revenues based on the actual or projected future shipments .", "we recognize freight revenues as shipments move from origin to destination .", "we allocate freight revenues between reporting periods based on the relative transit time in each reporting period and recognize expenses as we incur them .", "other revenues include revenues earned by our subsidiaries , revenues from our commuter rail operations , and accessorial revenues , which we earn when customers retain equipment owned or controlled by us or when we perform additional services such as switching or storage .", "we recognize other revenues as we perform services or meet contractual obligations .", "freight revenues from five of our six commodity groups increased during 2013 compared to 2012 .", "revenue from agricultural products was down slightly compared to 2012 .", "arc increased 5% ( 5 % ) , driven by core pricing gains , shifts in business mix and an automotive logistics management arrangement .", "volume was essentially flat year over year as growth in automotives , frac sand , crude oil and domestic intermodal offset declines in coal , international intermodal and grain shipments .", "freight revenues from four of our six commodity groups increased during 2012 compared to 2011 .", "revenues from coal and agricultural products declined during the year .", "our franchise diversity allowed us to take advantage of growth from shale-related markets ( crude oil , frac sand and pipe ) and strong automotive manufacturing , which offset volume declines from coal and agricultural products .", "arc increased 7% ( 7 % ) , driven by core pricing gains and higher fuel cost recoveries .", "improved fuel recovery provisions and higher fuel prices , including the lag effect of our programs ( surcharges trail fluctuations in fuel price by approximately two months ) , combined to increase revenues from fuel surcharges .", "our fuel surcharge programs generated freight revenues of $ 2.6 billion , $ 2.6 billion , and $ 2.2 billion in 2013 , 2012 , and 2011 , respectively .", "fuel surcharge in 2013 was essentially flat versus 2012 as lower fuel price offset improved fuel recovery provisions and the lag effect of our programs ( surcharges trail fluctuations in fuel price by approximately two months ) .", "rising fuel prices and more shipments subject to fuel surcharges drove the increase from 2011 to 2012 .", "in 2013 , other revenue increased from 2012 due primarily to miscellaneous contract revenue and higher revenues at our subsidiaries that broker intermodal and automotive services .", "in 2012 , other revenues increased from 2011 due primarily to higher revenues at our subsidiaries that broker intermodal and automotive services .", "assessorial revenues also increased in 2012 due to container revenue related to an increase in intermodal shipments. ."], "table": [["millions", "2013", "2012", "2011", "% (  % ) change 2013 v 2012", "% (  % ) change 2012 v 2011"], ["freight revenues", "$ 20684", "$ 19686", "$ 18508", "5% ( 5 % )", "6% ( 6 % )"], ["other revenues", "1279", "1240", "1049", "3", "18"], ["total", "$ 21963", "$ 20926", "$ 19557", "5% ( 5 % )", "7% ( 7 % )"]], "table_ori": [["<i>Millions</i>", "<i>2013</i>", "<i>2012</i>", "<i>2011</i>", "<i>% Change 2013 v 2012</i>", "<i>% Change 2012 v 2011</i>"], ["Freight revenues", "$20,684", "$19,686", "$18,508", "5%", "6%"], ["Other revenues", "1,279", "1,240", "1,049", "3", "18"], ["Total", "$21,963", "$20,926", "$19,557", "5%", "7%"]]}

Question: what was the percentage change in fuel surcharge revenues from 2011 to 2012?
Evidence:
text_21: our fuel surcharge programs generated freight revenues of $ 2.6 billion , $ 2.6 billion , and $ 2.2 billion in 2013 , 2012 , and 2011 , respectively .
Program: subtract(2.6, 2.2), divide(#0, 2.2)
Answer:
str_answer: 18%
exe_answer: 0.18182