Mo. Rev. Stat. § 622.300
1. The division shall, prior to the beginning of each fiscal year beginning with the fiscal year commencing on July 1, 1997, make an estimate of the expenses to be incurred by it during such fiscal year reasonably attributable to the regulation of railroads, railroad corporations, street railroads and street railroad corporations, as provided in chapters 386, 387, 388, 389, and 391 and this chapter, and shall also separately estimate the amount of these expenses which are:
2. The division shall allocate to each of these groups of entities the estimated expenses directly attributable to the regulation of that group and an amount equal to such proportion of the estimated expenses not directly attributable to either group as the gross intrastate operating revenues of all entities within that group during the preceding calendar year bears to the total gross intrastate operating revenues of all railroads, railroad corporations, street railroads and street railroad corporations during that year. The division shall then assess the amounts allocated, subject to adjustment as herein provided, to the entities within each group, in proportion to their respective gross intrastate operating revenues during the preceding calendar year, except that:
(2) These assessments shall be adjusted in a manner as to provide that:
(L. 1996 S.B. 780)