I just changed it.
Average oil company profits are also ~8.3%, not 10%.
The Truth About Oil and Gasoline: An API Primer
http://www.energytomorrow.org/energy_issues/truth_about_oil_gasoline_primer.pdf
2007 Earnings by Industry, Page 14.
Of course I’ve got to recommend you stop vandalizing private property. I think that type of action is best left to the enemies.