How much did gas cost in 2015?

January 2015 $2.11 per gallon February 2015 $2.25 per gallon March 2015 $2.48 per gallon April 2015 $2.49 per gallon May 2015 $2.78 per gallon June 2015 $2.83 per gallon July 2015 $2.83 per gallon August 2015 $2.68 per gallon September 2015 $2.39 per gallon October 2015 $2.29 per gallon November 2015 $2.19 per gallon December 2015 $2.06 per gallon