Do you know a website that lists the average yearly oil prices per barrel since 1973? Very important, plz help

http://www.ioga.com/Special/crudeoil_His鈥?/a>Do you know a website that lists the average yearly oil prices per barrel since 1973? Very important, plz help
';wtrg economics.com'; , then click on ';oil price history and analysis'; It gives this info from 1947 to 2007. Hope this helps.