OPEC pumped more oil last month driven by higher output from Saudi Arabia , the cartel’s de facto leader, which has for more than a year led a coalition of big producers in curbing production. Total oil production in the Organization of the Petroleum Exporting Countries increased by 35,000 barrels a day in May, month-on-month, to average 31.87 million barrels a day, the cartel said Tuesday in its closely watched monthly report. Output in Saudi Arabia jumped by 85,500 barrels a day but was partly offset by production outages in Nigeria, Venezuela and Libya, the report said, citing secondary sources. However, Saudi Arabia’s own data for May showed it increased its own output by 161,400 barrels a day, according to the report. OPEC every month publishes two sets of oil-production data: one based on what its members’ governments tell the cartel and another based on its own analysis of […]