http://www.bloomberg.com/apps/news?pid=20601109&sid=au.c3bEf58NI&refer=home

*FYI, since 2002 the trade-weighed value of the U.S. dollar has depreciated by 30% (thus the gap between 'Dollar/BBL' and 'Euro/BBL' in the above chart)
Data Courtesy: Bloomberg + EIA