what percent of total operating expenses was fuel in 2007?
volume declines in cement , some agricultural products , and newsprint shipments partially offset the increases . operating expenses millions of dollars 2008 2007 2006 % (  % ) change 2008 v 2007 % (  % ) change 2007 v 2006 .

| <i>Millions of Dollars</i> | <i>2008</i> | <i>2007</i> | <i>2006</i> | <i>% Change 2008 v 2007</i> | % Change 2007 v 2006 |
| :--- | :--- | :--- | :--- | :--- | :--- |
| Compensation and benefits | $4,457 | $4,526 | $4,535 | (2)% | -% |
| Fuel | 3,983 | 3,104 | 2,968 | 28 | 5 |
| Purchased services and materials | 1,902 | 1,856 | 1,756 | 2 | 6 |
| Depreciation | 1,387 | 1,321 | 1,237 | 5 | 7 |
| Equipment and other rents | 1,326 | 1,368 | 1,396 | (3) | (2) |
| Other | 840 | 733 | 802 | 15 | (9) |
| Total | $13,895 | $12,908 | $12,694 | 8 % | 2% |

operating expenses increased $ 987 million in 2008 . our fuel price per gallon rose 39% ( 39 % ) during the year , increasing operating expenses by $ 1.1 billion compared to 2007 . wage , benefit , and materials inflation , higher depreciation , and costs associated with the january cascade mudslide and hurricanes gustav and ike also increased expenses during the year . cost savings from productivity improvements , better resource utilization , and lower volume helped offset these increases . operating expenses increased $ 214 million in 2007 versus 2006 . higher fuel prices , which rose 9% ( 9 % ) during the period , increased operating expenses by $ 242 million . wage , benefit and materials inflation and higher depreciation expense also increased expenses during the year . productivity improvements , better resource utilization , and a lower fuel consumption rate helped offset these increases . compensation and benefits 2013 compensation and benefits include wages , payroll taxes , health and welfare costs , pension costs , other postretirement benefits , and incentive costs . productivity initiatives in all areas , combined with lower volume , led to a 4% ( 4 % ) decline in our workforce for 2008 , saving $ 227 million compared to 2007 . conversely , general wage and benefit inflation and higher pension and postretirement benefits increased expenses in 2008 , partially offsetting these reductions . operational improvements and lower volume levels in 2007 led to a 1% ( 1 % ) decline in our workforce , saving $ 79 million in 2007 compared to 2006 . a smaller workforce and less need for new train personnel reduced training costs during the year , which contributed to the improvement . general wage and benefit inflation mostly offset the reductions , reflecting higher salaries and wages and the impact of higher healthcare and other benefit costs . fuel 2013 fuel includes locomotive fuel and gasoline for highway and non-highway vehicles and heavy equipment . diesel fuel prices , which averaged $ 3.15 per gallon ( including taxes and transportation costs ) in 2008 compared to $ 2.27 per gallon in 2007 , increased expenses by $ 1.1 billion . a 4% ( 4 % ) improvement in our fuel consumption rate resulted in $ 136 million of cost savings due to the use of newer , more fuel 2008 operating expenses .

fuel_2007 = 3104
fuel_total = 12908
percent_2007 = fuel_2007 / fuel_total
answer = percent_2007 * 100