-2.5% Oklahoma Policy Institute // February 26, 2020 // Updated: February 26, 2020 Number of the Day The percentage decrease in violent crime in Oklahoma between 2010 and 2018. [Source: Oklahoma Bureau of Narcotics] See previous Numbers of the Day here. Share This:FacebookTwitterLinkedInTumblrRedditPocketEmailPrint ABOUT THE AUTHOR Oklahoma Policy Institute // @okpolicy // digital@okpolicy.org Oklahoma Policy Insititute (OK Policy) advances equitable and fiscally responsible policies that expand opportunity for all Oklahomans through non-partisan research, analysis, and advocacy.