(d) The applicable tax rate for diesel fuel, blended fuel that contains diesel fuel or is intended for use as diesel fuel, and kerosene, other than aviation grade kerosene, which are taxed as a highway fuel pursuant to subparagraph (a) of this paragraph, shall be converted to a cents-per-gallon rate, rounded to the nearest tenth of a cent, and adjusted quarterly by the director, effective on July 1, October 1, January 1, and April 1, based on the average retail price per gallon of number 2 diesel in the State, as determined in the most recent survey of retail diesel fuel prices that includes a Statewide representative random sample conducted by the Board of Public Utilities, Office of the Economist, or its successor. Notwithstanding the provisions of subparagraph (a) of this paragraph to the contrary, for the period from the 2016 implementation date through December 31, 2016, no rate of tax shall be applied to diesel fuel, blended fuel that contains diesel fuel or is intended for use as diesel fuel, or kerosene, other than aviation grade kerosene; for the period from January 1, 2017 through June 30, 2017, the applicable rate for those fuels shall be 70 percent of the rate otherwise determined pursuant to subparagraph (a) of this paragraph, and for July 1, 2017 and thereafter the applicable rate for those fuels determined pursuant to subparagraph (a) of this paragraph.