The Organization of the Petroleum Exporting Countries in a report also forecast supply from non-member countries will fall more sharply next year, which would suggest its strategy, reaffirmed last week of defending market share, is working.
OPEC's report follows an acrimonious OPEC meeting on Dec. 4, where it rolled over a policy of pumping crude to safeguard market share, despite oil prices that have more than halved to $40 a barrel in 18 months due to excess supply.
A year ago, Saudi Arabia pushed though an OPEC decision to defend market share instead of cutting output to support prices, hoping to slow growth in rival supplies such as U.S. shale oil.
"U.S. tight oil production, the main driver of non-OPEC supply growth, has been declining since April," OPEC said in the report. "This downward trend should accelerate in coming months given various factors, mainly low oil prices and lower drilling activities."
Supply outside OPEC is expected to decline by 380,000 barrels per day (bpd) in 2016, the report said, as output falls in regions such as the United States and former Soviet Union. Last month, OPEC predicted a drop of 130,000 bpd.
But OPEC also increased its 2015 non-OPEC supply growth forecast by 280,000 bpd, citing upward revisions to output from the United States, Brazil, Russia and the UK, among other countries.
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