http://www.thelostogle.com/2016/05/18/reuters-exposes-energy-industry-overlords-for-role-in-oklahoma-budget-crisis/

"...After intense lobbying, Oklahoma’s oilmen scored a victory two years ago. State lawmakers voted to keep in place some of the lowest taxes on oil and gas production in the United States – a break worth $470 million in fiscal year 2015 alone…"  (Oklahoma, now fiscally on the ropes.. with no "fund" to fall back on..).