Rate increases.

The rates posted under section 137C.23 shall not be increased until sixty days’ notice of the proposed increase has been given to the regulatory authority. [C24, 27, 31, 35, 39, § 2842; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, §170.37; C79, 81, §170B.12 ] 90 Acts, ch 1204, §66 C91, §137C.24