(a) The board shall determine:
(1) the amount of interest coming due on all bonds outstanding, except for those dedicated pursuant to Section 17.0111 of this code;
(2) the amount of principal of bonds maturing and becoming payable during the fiscal year, except for those bonds dedicated pursuant to Section 17.0111 of this code; and
(3) the average annual principal and interest requirements on all outstanding bonds, except for those bonds dedicated pursuant to Section 17.0111 of this code.
(b) The comptroller shall transfer to the interest and sinking fund, after taking into account any money and securities on deposit in the interest and sinking fund, an amount necessary to pay:
(1) all principal and interest maturing on the bonds, except for those bonds dedicated pursuant to Section 17.0111 of this code, during the fiscal year;
(2) all collection charges and exchanges on the bonds in Subsection (b)(1) of this section; and
(3) the money sufficient to establish and maintain an additional reserve equal to the average annual principal and interest requirements on all outstanding bonds, except for those bonds dedicated pursuant to Section 17.0111 of this code.