non cash expense are what percent of total operating expense in 2014?
operating expenses millions 2014 2013 2012 % (  % ) change 2014 v 2013 % (  % ) change 2013 v 2012 .

| <i>Millions</i> | <i>2014</i> | <i>2013</i> | <i>2012</i> | <i>% Change 2014 v 2013</i> | <i>% Change 2013 v 2012</i> |
| :--- | :--- | :--- | :--- | :--- | :--- |
| Compensation and benefits | $5,076 | $4,807 | $4,685 | 6% | 3% |
| Fuel | 3,539 | 3,534 | 3,608 | - | (2) |
| Purchased services and materials | 2,558 | 2,315 | 2,143 | 10 | 8 |
| Depreciation | 1,904 | 1,777 | 1,760 | 7 | 1 |
| Equipment and other rents | 1,234 | 1,235 | 1,197 | - | 3 |
| Other | 924 | 849 | 788 | 9 | 8 |
| Total | $15,235 | $14,517 | $14,181 | 5% | 2% |

operating expenses increased $ 718 million in 2014 versus 2013 . volume-related expenses , incremental costs associated with operating a slower network , depreciation , wage and benefit inflation , and locomotive and freight car materials contributed to the higher costs . lower fuel price partially offset these increases . in addition , there were approximately $ 35 million of weather related costs in the first quarter of operating expenses increased $ 336 million in 2013 versus 2012 . wage and benefit inflation , new logistics management fees and container costs for our automotive business , locomotive overhauls , property taxes and repairs on jointly owned property contributed to higher expenses during the year . lower fuel prices partially offset the cost increases . compensation and benefits 2013 compensation and benefits include wages , payroll taxes , health and welfare costs , pension costs , other postretirement benefits , and incentive costs . volume-related expenses , including training , and a slower network increased our train and engine work force , which , along with general wage and benefit inflation , drove increased wages . weather-related costs in the first quarter of 2014 also increased costs . general wages and benefits inflation , including increased pension and other postretirement benefits , and higher work force levels drove the increases in 2013 versus 2012 . the impact of ongoing productivity initiatives partially offset these increases . fuel 2013 fuel includes locomotive fuel and gasoline for highway and non-highway vehicles and heavy equipment . volume growth of 7% ( 7 % ) , as measured by gross ton-miles , drove the increase in fuel expense . this was essentially offset by lower locomotive diesel fuel prices , which averaged $ 2.97 per gallon ( including taxes and transportation costs ) in 2014 , compared to $ 3.15 in 2013 , along with a slight improvement in fuel consumption rate , computed as gallons of fuel consumed divided by gross ton-miles . lower locomotive diesel fuel prices , which averaged $ 3.15 per gallon ( including taxes and transportation costs ) in 2013 , compared to $ 3.22 in 2012 , decreased expenses by $ 75 million . volume , as measured by gross ton-miles , decreased 1% ( 1 % ) while the fuel consumption rate , computed as gallons of fuel consumed divided by gross ton-miles , increased 2% ( 2 % ) compared to 2012 . declines in heavier , more fuel-efficient coal shipments drove the variances in gross-ton-miles and the fuel consumption rate . purchased services and materials 2013 expense for purchased services and materials includes the costs of services purchased from outside contractors and other service providers ( including equipment maintenance and contract expenses incurred by our subsidiaries for external transportation services ) ; materials used to maintain the railroad 2019s lines , structures , and equipment ; costs of operating facilities jointly used by uprr and other railroads ; transportation and lodging for train crew employees ; trucking and contracting costs for intermodal containers ; leased automobile maintenance expenses ; and tools and supplies . expenses for purchased services increased 8% ( 8 % ) compared to 2013 primarily due to volume- 2014 operating expenses .

depreciation_2014 = 1904
depreciation_total = 15235
percent_depreciation = depreciation_2014 / depreciation_total
answer = percent_depreciation * 100