Oil prices plummet again as Saudis vow to maintain output

Opec and US production falls as markets see price set to end 30% lower than last yearOil prices fell over 3% on Wednesday after new data showed US crude supplies continuing to grow while Saudi Arabia promised to keep up its policy of pumping its wells flat out. A barrel of benchmark Brent crude was changing hands for $36.58 at one stage, leaving it on track to end 2015 30% lower as demand failed to keep up with supply.The latest fall – in touching distance of 11-year lows – should be