Royal Dutch Shell ( RDSa.L ), Europe’s largest oil company, reported its lowest annual income in at least 13 years on Thursday, vowing to take further steps to weather the worst downturn in over a decade. Shell, whose shareholders last week approved its takeover of rival BG Group ( BG.L ), said 2015 income fell 87 percent to $1.94 billion, in line with analysts’ estimates, the lowest since at least 2002 as its oil and gas production unit took a big hit. “Shell will take further impactful decisions to manage through the oil price downturn, should conditions warrant that,” Chief Executive Ben van Beurden said in a statement. Shell’s earnings are the latest demonstration of how badly oil producers are suffering from weak oil prices. The world’s largest oil company, ExxonMobil ( XOM.N ), this […]