The OPEC reference basket of crudes fell $0.89 (2.81%) to $30.74 a barrel, coming close to levels last seen on January 23, 2004.
The average price of OPEC oil in December is $34.63, while in 2014 the average price of the oil basket was $96.29 per barrel, and $105.87 per barrel in 2013, RIA Novosti reminds.
