; and (ii) economic assumptions regarding wage and salary growth that reflect the specific past, and likely future, pay for such employees. (B) The United States Postal Service shall provide any data or projections the Office requires in order to determine the normal-cost percentage for employees of the United States Postal Service, consistent with subparagraph (A). (C) The Office shall review the determination of the normal-cost percentage for employees of the United States Postal Service and make such adjustments as the Office considers necessary— (i) upon request of the United States Postal Service, but not more frequently than once each fiscal year; and (ii) at such other times as the Office considers appropriate. (6) For the purpose of carrying out subsection (b)(1)(B), and consistent with paragraph (5), for fiscal year 2017, and each fiscal year thereafter, the Office shall use— (A) demographic factors specific to current and former employees of the United States Postal Service, unless such data cannot be generated; and (B) economic assumptions regarding wage and salary growth that reflect the specific past, and likely future, pay for current employees of the United States Postal Service. ; and (2) in subsection (b)— (A) by redesignating paragraph (5) as paragraph (6); and (B) by inserting after paragraph (4) the following: (5) (A) In this paragraph, the term postal funding surplus means the amount by which the amount of the supplemental liability computed under paragraph (1)(B) is less than zero. (B) If the amount of supplemental liability computed under paragraph (1)(B) as of the close of any fiscal year after the date of enactment of the Postal Service Reform Act of 2017 is less than zero, the Office shall establish an amortization schedule, including a series of equal annual installments that— (i) provide for the liquidation of the postal funding surplus in 30 years, commencing on September 30 of the subsequent fiscal year