OPEC's oil output falls to 5-year low in May as group warns of weaker demand By: CNBC.com News June 13, 2019 at 06:40 AM EDT Oil production from OPEC fell by 236,000 barrels per day in May to 29.88 million bpd, the lowest level since June 2014. Read More >> Related Stocks: Ipath Pure Beta Crude Oil ETN