COLUMBUS, Ohio – Oil prices slid to a new low for the year Thursday because of growing doubts that the $789 billion stimulus package will reinvigorate the economy and demand for energy. Crude supplies in the U.S. reached an 82-week high last week, according to the Department of Energy, showing just how far demand has fallen. ... Light, sweet crude for March delivery tumbled $1.96, more than 5 percent, to settle at $33.98 a barrel on the New York Mercantile Exchange.