Brent, the reference oil for Angolan exports, fell by more than 5 percent this Tuesday, penalized by a new confinement in China and by growing fears of a global recession. At 3 pm, a barrel of North Sea Brent for delivery in October was down 5.05 percent to $99.78 and a barrel of North American WTI oil, for delivery in the same month, lost 4.84 percent to 92.31 dollars. On the supply side, concerns appear