OPEC and its partners estimate they implemented 99% of their agreed oil-supply curbs in December, according to a delegate who asked not to be named.
The 23-nation alliance known as OPEC+ aimed to withhold 7.2 million barrels a day of crude from the market in January -- about 7% of global supplies. They agreed to increase production by 500,000 barrels from December as part of a plan to ease the cuts.