Financial report context:
results of operations operating revenues millions 2014 2013 2012 % (  % ) change 2014 v 2013 % (  % ) change 2013 v 2012 .

Financial table:
millions: freight revenues; 2014: $ 22560; 2013: $ 20684; 2012: $ 19686; % (  % ) change 2014 v 2013: 9% ( 9 % ); % (  % ) change 2013 v 2012: 5% ( 5 % )
millions: other revenues; 2014: 1428; 2013: 1279; 2012: 1240; % (  % ) change 2014 v 2013: 12% ( 12 % ); % (  % ) change 2013 v 2012: 3% ( 3 % )
millions: total; 2014: $ 23988; 2013: $ 21963; 2012: $ 20926; % (  % ) change 2014 v 2013: 9% ( 9 % ); % (  % ) change 2013 v 2012: 5% ( 5 % )

Additional report context:
we generate freight revenues by transporting freight or other materials from our six commodity groups . freight revenues vary with volume ( carloads ) and average revenue per car ( 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 all six commodity groups increased during 2014 compared to 2013 driven by 7% ( 7 % ) volume growth and core pricing gains of 2.5% ( 2.5 % ) . volume growth from grain , frac sand , rock , and intermodal ( domestic and international ) shipments offset declines in crude oil . 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 essentially was flat year over year as growth in automotive , frac sand , crude oil and domestic intermodal offset declines in coal , international intermodal and grain shipments . our fuel surcharge programs generated freight revenues of $ 2.8 billion , $ 2.6 billion , and $ 2.6 billion in 2014 , 2013 , and 2012 , respectively . fuel surcharge in 2014 increased 6% ( 6 % ) driven by our 7% ( 7 % ) carloadings increase . fuel surcharge in 2013 essentially was 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 ) . in 2014 , other revenue increased from 2013 due to higher revenues at our subsidiaries , primarily those that broker intermodal and automotive services , accessorial revenue driven by increased volume and per diem revenue for container usage ( previously included in automotive freight revenue ) . 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. .

Question: what was the percentage change in fuel surcharge program freight revenue from 2013 to 2014?
Answer: 8%