(a) The rate of assessment set by the commissioner may not exceed $2 per enrollee.
(b) The commissioner shall annually adjust the rate of assessment of the per capita maintenance tax so that the tax imposed that year, together with any unexpended funds produced by the tax, produces the amount the commissioner determines is necessary to pay the expenses during the succeeding year of regulating health maintenance organizations.

(c) The rate of assessment may differ between basic health care plans, limited health care service plans, and single health care service plans and must equitably reflect any differences in regulatory resources attributable to each type of plan.