; (2) in subsection (a), as so designated, by inserting after the first sentence the following: If a statute that an agency administers is silent or ambiguous, and an agency has followed the procedures in section 553 or 554 of this title, as applicable, a reviewing court shall defer to the agency’s reasonable or permissible interpretation of that statute. ; (3) by striking In making the foregoing determinations and inserting the following: (b) Review of record In making the determinations under subsection (a) ; (4) in subsection (b), as so designated, by inserting except any part of the record that the agency excluded from consideration pursuant to section 553(h)(1) of this title, after party, ; and (5) by adding at the end the following: (c) Unreasonable delay For purposes of subsection (a)(1), unreasonable delay shall include— (1) when an agency has not issued a notice of proposed rulemaking within 1 year of the date of enactment of the legislation mandating the rulemaking, where no deadline for the rulemaking was specified in the enacted law; (2) when an agency has not issued a final version of a proposed rule within 1 year of date on which the proposed rule was published in the Federal Register