OPEC members’ net oil export revenues rose to $711 billion in 2018, marking a 32 percent increase in one year.
The 14-member Organization of the Petroleum Exporting Countries pumped 30.17 million barrels per day (bpd) in May, the survey showed, down 60,000 bpd from April and the lowest OPEC total since 2015, Reuters survey shows.
Brent crude oil prices on Thursday hit their highest so far this year, pushed up by ongoing supply cuts led by OPEC and by US sanctions against Venezuela and Iran.
Except for Qatar, the oil producing gulf countries are adamant on raising oil prices to fill budget deficits.
The yellow vest movement has spread to several countries around the world who are protesting similar issues.
The tiny, energy-rich Gulf Arab nation of Qatar says it will withdraw from the Organization of the Petroleum Exporting Countries (OPEC) in January.
Brent crude oil futures were trading at $85.85 per barrel at 0104 GMT, down 44 cents, or 0.5 percent, from their last close.
The Kenyan government is stuck between pleasing citizens and trying to secure a loan from the IMF in a bid to raise state revenues.
Many countries, including US allies in Europe as well as China and India oppose the sanctions, but the US government said it wants as many countries as possible to stop buying Iranian oil.
The latest forecast from the US Energy Information Administration predicts that US output will grow next year to 11.8 million barrels a day, its highest since 1970.
Maduro, sworn in after an election viewed by the international community as a sham, has promised to free some political opponents and admitted US sanctions are having an impact on the country.
The small island nation of Bahrain announced on April 1, that it had discovered extensive tight oil and deep gas resources off the west coast of the kingdom, which could make the once marginal oil producer potentially a major player in the market.
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