Year-to-date change: 18.3%
It appears that (at least for now) Brent crude is more indicative of global supply and demand for oil than is West Texas Intermediate, as the glut of supply in Cushing, OK has caused WTI to lag other light, sweet grades.
Brent crude is now at its highest level since September 2008 as violence in Libya and the fear of contagion has the market worried about future supply. Currently, the Middle East produces 57% of the world's oil.
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Last updated February 28 2011: 7:24 AM ET