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Crude-oil futures fell further on Thursday after the Organization of the Petroleum Exporting Countries cut demand forecasts for its oil and investors worried about the health of the eurozone’s economy.

On the New York Mercantile Exchange, light, sweet crude futures for delivery in December fell 77 cents, or 1%, to settle at $77.91 a barrel. December Brent crude on London’s ICE Futures exchange fell 9 cents, or 0.1%, to $82.86 a barrel. Both benchmarks are down for five out of the past six sessions and off nearly 30% from a June peak. In its annual world outlook released earlier Thursday, OPEC predicted less demand for its oil through 2017. OPEC said demand for its crude oil would fall to 28.2 million barrels a day by the end of 2017, as output from producers outside the cartel, such as the U.S. and Canada, Latin American countries, and Russia, continue to rise. Demand for OPEC crude will pick up again in 2018, but a year later it will still be lower than demand for 2013, OPEC said. In last year’s outlook, OPEC noted the rise of non-OPEC supply for the first time. It predicted then that demand for its crude would reach 29.2 million barrels a day by 2018 and 30.3 million barrels a day in 2013.

Comments from European Central Bank President Mario Draghi also dragged oil prices down. In a news conference Thursday after the ECB left interest rates unchanged, Draghi offered a drab assessment of the eurozone economy, adding to concerns that slack economic activity in Europe and elsewhere would further dent demand for oil. Oil futures snapped a four-session losing streak on Wednesday after the weekly U.S. supply report showed an smaller-than-expected increase in inventories. Brent crude got support from reports of violence in Libya. Attacks on Libya’s western oil fields by local militia on Wednesday cut daily oil production volumes by more than a third, disrupting around 300,000 barrels a day of oil supply, officials there said. Earlier in the week, futures had fallen to fresh multiyear lows. Investors remain worried about the combination of plentiful supplies and diminished demand, with all eyes on the coming OPEC meeting in two weeks. Investors will be parsing any signs that the cartel will cut its production — a move that would push prices higher. Saudi Arabia, the world’s No. 1 crude exporter and a key OPEC member, has not indicated it wants to follow that route. It recently cut prices for its oil sold to the U.S. and elsewhere, in a bid to preserve its market share rather than provide a floor to crude prices.