STEP ONE: Determine the cost index from the cost index source for the most recent year.
STEP TWO: Determine the cost index from the cost index source for the year that the annual cost of maintenance of the works of improvement was stated in the plan.
STEP THREE: Divide the number determined in STEP ONE by the number determined in STEP TWO.
STEP FOUR: Multiply the result of STEP THREE by the annual cost of maintenance of the works of improvement that is stated in the plan.
IC 14-33-14-8