The same day, the U.S. Commerce Department released data show that the U.S. first quarter economic growth for the first time with a predictive value of 2.2% to less than 3.0% in the fourth quarter of last year was also lower than the market average forecast of 2.5 percent. The U.S. economic slowdown led to the fall in oil prices in early trading. At the same time, however, the dollar under pressure fell against a basket of currencies, fell 0.6 percent. The weak dollar increased the attractiveness of dollar-denominated crude oil, crude oil before the repair decline, and turn up. 

The Reuters / University of Michigan survey, followed by a release in April U.S. consumer confidence index rose to 76.4, close to its highest level since the financial crisis continue to push oil prices. 

Moreover, since the U.S. Federal Reserve monetary policy meeting ended on the 25th, the market expected a more relaxed monetary policy continues to provide oil upward momentum. 

To the closing, the New York Mercantile Exchange, light sweet crude for June delivery was up 38 cents to close at $ 104.93 a barrel, or 0.36 percent. The week, New York oil prices rose $ 1.88, or 1.82%. 

However, due to the Standard & Poor's cut Spain's sovereign credit rating, the debt crisis in Europe worry about the weight of oil prices in London. North Sea Brent crude for June delivery was down 9 cents to close at $ 119.83 a barrel. The week up $ 1.07, or 0.90 percent. 

Analysts believe that, because of Libya's oil production increased, and the Iran nuclear issue on the relaxation of tensions, global oil supply growth will lead to oil prices fell in the coming weeks. The U.S. Energy Information Administration released the same day reported that, despite U.S. and European economic sanctions against Iran in March and April, the average daily supply of global oil and fuel for vehicles is still better than the average daily demand of more than 500,000 barrels.