[Vanguard] In an apparent reflection of the measures taken to achieve stability in the global market by the Organisation of Petroleum Exporting Countries, OPEC, pipeline vandalism and oil theft in the Niger-Delta, Nigeria's oil production has fallen by 30 per cent in the last four years to 1.423 million barrels per day, mb/d in 2020 from 2.041 million barrels per day, mb/d in 2017.