Beginning in 2018 and each year thereafter, on or about September 15th, for the estates of decedents who die during the succeeding calendar year, the assessor shall multiply the cost-of-living adjustment by the dollar amount contained in section 4102, subsection 5 applicable to estates of decedents dying on or after January 1, 2018. For the purposes of this section, the “cost-of-living adjustment” is the Chained Consumer Price Index for the 12-month period ending June 30th of the preceding calendar year divided by the Chained Consumer Price Index for the 12-month period ending June 30, 2017. If the dollar amount, adjusted by the application of the cost-of-living adjustment, is not a multiple of $10,000, any increase must be rounded to the nearest multiple of $10,000. [PL 2019, c. 607, Pt. D, §5 (AMD).]