The estimated percentage of use fuel consumed in each county that is calculated annually pursuant to the provisions of this Article shall be used to calculate the distribution pursuant to A.R.S. § 28-1598 commencing with distributions made after June 30 of that year and shall continue to be used until the next succeeding June 30 or until a new estimated percentage of use fuel consumed in each county is calculated in accordance with the provisions of this Article, whichever is later.
Ariz. Admin. Code § R17-1-349