244.49.0.4. If the municipality avails itself of the power under section 253.27 in respect of its property assessment roll, the operations described in the second and third paragraphs are performed to calculate an adjusted coefficient, by which the basic rate is multiplied, to establish the minimum rate specific to the category of agricultural immovables for either of the first two fiscal years for which the roll applies.
The first operation in relation to the calculation of the adjusted coefficient consists in subtracting the second of the following coefficients from the first:
(1) the coefficient calculated pursuant to section 244.49.0.2 for the fiscal year for which the minimum specific rate is established; and
(2) the coefficient applicable for the last fiscal year for which the property assessment roll of the municipality in force immediately before the roll referred to in the first paragraph applied.
The second operation consists in algebraically adding the coefficient described in subparagraph 2 of the second paragraph and the number that is one third or two thirds of the difference resulting from the subtraction under the second paragraph, according to whether the fiscal year for which the maximum specific rate is established is the first or the second fiscal year for which the roll referred to in the first paragraph applies.
If the property assessment roll in respect of which the municipality avails itself of the power under section 253.27 applies for two fiscal years only, the adjusted coefficient is calculated only for the first of those fiscal years. To that end, for the purposes of the third paragraph, one half, rather than one third or two thirds, of the difference resulting from the subtraction under the second paragraph is taken into account.