Section 66 - Apportionment of costs1. The total of the several amounts set forth in the annual estimate prepared pursuant to section sixty-seven of this chapter shall be apportioned to each participant in the proportion that the full valuation of its taxable real property bears to the aggregate full valuation of all participants; provided, however, that the rules and regulations adopted pursuant to section sixty-five of this chapter may provide that apportionments to a class of participants shall be based on a percentage of full valuation rather than on entire full valuation.2. The full valuation of taxable real property shall be determined by the use of state equalization rates established pursuant to article two-a of the tax law. The full valuation of a public benefit corporation shall be the same as the full valuation of taxable real property of the tax district or districts within which it operates.N.Y. Work. Comp. Law § 66