The comptroller shall assess against all insurers to which this chapter applies amounts for each state fiscal year necessary, as determined by the commissioner, to collect a combined total equal to the lesser of:
(1) the total amount that the General Appropriations Act appropriates from the volunteer fire department assistance fund account in the general revenue fund for that state fiscal year other than appropriations for contributions to the Texas Emergency Services Retirement System made under Section 614.104(d), Government Code; or
(2) $30 million.