Ill. Admin. Code tit. 83, § 285.4020
4) Net amount outstanding, which equals the greater of:
c) For each type of issue, the following information is required:
4) Average interest rate;
d) Additional instructions:
2) Provide totals wherever applicable;
4) Do not include long-term debt due within one year; and
1) Formulas used to set interest rates on variable and adjustable rate issues;
3) Documents supporting all interest rates;