Oil prices capped a second year as one of the worst-performing commodities, as a global glut of crude continued to weigh on the market. After plunging from more than $100 a barrel to nearly $50 a barrel last year, U.S. oil prices fell 30% in 2015 to $37.04 a barrel. Brent, the global benchmark, fell 35% to $37.28 a barrel. U.S. prices posted a second straight annual loss for the first time since 1998. Brent prices fell for a third straight year. Robust production from U.S. shale-oil fields pushed the global crude market into oversupply in late 2014, and production rose again this year as producers including Saudi Arabia and Russia opted to keep output levels high. Inventories of crude oil in the U.S. stand near eight-decade highs as producers continue to produce at high rates to maximize profits in a low-price environment. “Shale has changed the world […]