average annual oil prices WCS-WTI Differential

Source: Alberta Government, NEB
Description: This line graph shows the prices of WTI, WCS, and the WCS minus WTI differential from January 2010 to April 2018. The average annual differential reached a high of $25 in December 2013, and then decreased. It has been increasing since November, 2017 and reached $23 in March 2018.
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