Citing figures from the Joint Organization Data Initiative, Bloomberg reports that first place now falls to Russia, which produced on average 10.49 million barrels of oil a day in December. By contrast, the average daily volume of oil extracted from Saudi oil fields in December stood at 10.46 million barrels. This is the first time Russian oil production has overtaken that of Saudi Arabia since last March, according to Bloomberg.

Both countries saw their output down from November, reports Bloomberg—Russia by 29,000 barrels a day, Saudi Arabia down by 260,000. This comes after members of the Organization of Petroleum Exporting Countries (OPEC) agreed at the end of that month to curb output by 1.2 million barrels a day to combat the oversupply that has caused a continual slump in crude prices since 2014.

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With production levels at 8.8 million barrels daily, the U.S. stood as the third-largest oil producer in December, according to Bloomberg, while Iraq and China followed at 4.5 million and 3.98 million barrels a day respectively.

Faced with slumping prices and a gradual shift to non-fossil fuel energy sources worldwide, Saudi Arabia announced last month it would launch a major renewable energy program with investment levels between $30 and $50 billion. Invitation for tenders will begin in April, according to the energy minister.