Opec released its Annual Statistical Bulletin (ASB) this week, which detailed its members’ oil export revenues. The group’s overall takings fell 13.2% from 2015, which itself was the lowest since 2004, to $445.7bn (see table).  Revenues are on track to post a moderate 14% gain in 2017, largely due to higher prices in Q1, but to fall just short of 2015’s figure. While Opec members would have been hoping for more sizeable gains to come in 2018, the latest IEA and Opec...