How much did diesel fuel cost in 1998?

January 1998 $1.25 per gallon February 1998 $1.22 per gallon March 1998 $1.19 per gallon April 1998 $1.18 per gallon May 1998 $1.19 per gallon June 1998 $1.19 per gallon July 1998 $1.17 per gallon August 1998 $1.15 per gallon September 1998 $1.14 per gallon October 1998 $1.15 per gallon November 1998 $1.14 per gallon December 1998 $1.11 per gallon