The December figure compares with 117% in November.
The International Energy Agency said this week that the group missed its production targets by 790,000 barrels per day (bpd) in December as members like West African producers Nigeria and Angola struggled to raise output.
Compliance from members of the Organization of the Petroleum Exporting Countries (OPEC) was at 127% in December, while non-OPEC producers in the alliance achieved a compliance of 114%, the sources said.
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