From the mid-1980s to September 2003 , the inflation-adjusted price of a barrel of crude oil on NYMEX was generally under US $ 25/barrel .

In May 2013 , Al-Qaeda attackers Attack blew up Destroying Yemen 's main oil pipeline , halting Process_end the flow of exported crude oil .

According to the Bangalore City Police , the blasts were caused Causation by low-intensity crude bombs triggered Causation by timers .