Oil prices have plunged more than 50 percent since June last year. Oil prices have slumped even further to reach six-year lows, amid oversupplies by certain countries and a sluggish global economy. The US benchmark West Texas Intermediate (WTI) for February delivery saw an 18-cent drop on Tuesday, selling at USD 45.89 per barrel on the New York Mercantile Exchange. It was the WTI’s lowest close since...