Annual U.S. crude oil production reached another record level at 12.23 million barrels per day (b/d) in 2019, 1.24 million b/d, or 11%, more than 2018 levels. The 2019 growth rate was down from a 17% growth rate in 2018. In November 2019, monthly U.S. crude oil production averaged 12.86 million b/d, the most monthly crude oil production in U.S. history, according to the U.S. Energy Information Administration’s (EIA) Petroleum Supply Monthly. U.S. crude oil production has increased significantly during the past 10 years, and the increase has been driven mainly by production from tight rock formations developed using horizontal drilling and hydraulic fracturing to extract hydrocarbons.