will continue to seek recovery from our customers through our fuel surcharge programs and expand our fuel conservation efforts . 2022 capital plan 2013 in 2009 , we expect our total capital investments to be approximately $ 2.8 billion ( which may be revised if business conditions or new laws or regulations affect our ability to generate sufficient returns on these investments ) . see further discussion in this item 7 under liquidity and capital resources 2013 capital plan . 2022 financial expectations 2013 we are cautious about the economic environment ; however , we anticipate continued pricing opportunities , network improvement , and increased productivity in 2009 . results of operations operating revenues millions of dollars 2008 2007 2006 % (  % ) change 2008 v 2007 % (  % ) change 2007 v 2006 .
in 2008 what was the percent of the total operating revenues that was associated with other revenues
freight revenues are revenues generated by transporting freight or other materials from our six commodity groups . freight revenues vary with volume ( carloads ) and average revenue per car ( arc ) . arc is driven by changes in price , traffic mix and fuel surcharges . as a result of contractual obligations with some of our customers , we have provided incentives for meeting or exceeding specified cumulative volumes or shipping to and from specific locations , which we record as a reduction to freight revenues based on the actual or projected future shipments . we recognize freight revenues on a percentage-of- completion basis as freight moves 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 the six commodity groups increased during 2008 , with particularly strong growth from agricultural and energy shipments . while revenues generated from chemical and industrial products shipments grew in 2008 compared to 2007 , hurricanes gustav and ike reduced shipments of these commodities . revenues generated from automotive shipments declined versus 2007 . greater fuel cost recoveries and core pricing improvement combined to increase arc during 2008 . fuel cost recoveries include fuel surcharge revenue and the impact of resetting the base fuel price for certain traffic , as described below in more detail . the severe economic downturn during the fourth quarter compounded already declining volumes experienced during the first nine months of 2008 due to ongoing weakness in certain market sectors . as a result , we moved fewer intermodal , automotive , industrial products , and chemical shipments , which more than offset volume growth from agricultural and energy shipments . our fuel surcharge programs ( excluding index-based contract escalators that contain some provision for fuel ) generated $ 2.3 billion in freight revenues during 2008 . fuel surcharge revenue is not comparable to prior periods due to the implementation of new mileage-based fuel surcharge programs beginning in april 2007 for regulated traffic . as previously disclosed in our 2006 annual report on form 10-k , the stb .