VIENNA, Dec. 12 (Xinhua) -- The output from the Organization of Petroleum Exporting Countries (OPEC) decreased as Iran pumped less oil last month, a monthly report released by the cartel showed on Wednesday.

In November, OPEC's output decreased by around 11,000 barrels per day (bpd), said the report.

The decrease was mainly due to the 380,000 bpd decline in Iran's output, which dropped below 3 million bpd, for the first time lower since the beginning of 2016.

One of the largest oil producers in OPEC, Iran has been under U.S. sanctions for several months now.

Meanwhile, Saudi Arabia increased its crude production in November.

In its report, OPEC forecast 2019 demand for its oil could fall to 31.44 million bpd, around 100,000 bpd less than forecast last month.