Abu Dhabi, the desert emirate holding about 6% of the world's oil, cut export prices for its crude for the seventh consecutive month and to the lowest since 2009 amid a global price slump. Murban crude, its main grade, sold in January for $46.40 a barrel, or 23% below December's level, according to an e-mailed statement from Abu Dhabi National Oil Co. Murban hasn't sold for less since February 2009, data compiled by Bloomberg show. Oil has fallen 47% in the last six months as swelling supply, mainly from North American shale deposits, has outpaced demand. The Organization of Petroleum Exporting Countries decided to maintain its output target on Nov. 27, fanning speculation that Saudi Arabia and other group members are seeking to preserve market share and make non-OPEC producers bear some of the burden of reducing the supply glut.