; and (B) 1 plus the percentage increase (if any) in the national population of children from July 1 in the previous fiscal year to July 1 in the fiscal year involved, as determined by the Secretary based on the most recent published estimates of the Bureau of the Census before the beginning of the fiscal year involved, plus 1 percentage point. . (2) Prevention of duplicate appropriations for fiscal year 2018 Notwithstanding any other provision of law, insofar as funds have been appropriated under subsection (a)(21) of section 2104 of the Social Security Act ( 42 U.S.C. 1397dd ), as such subsection is in effect on the day before the date of the enactment of this Act, to provide allotments to States under the State Children’s Health Insurance Program established under title XXI of the Social Security Act ( 42 U.S.C. 1397aa et seq.) (whether implemented under title XIX, XXI, or both, of the Social Security Act) for fiscal year 2018— (A) any amounts that are so appropriated that are not so allotted and obligated before the date of the enactment of this Act, are rescinded; and (B) any amount provided for CHIP allotments to a State under this section (and the amendments made by this section) for such fiscal year shall be reduced by the amount of such appropriations so allotted and obligated before such date. (b) Allotments Section 2104(m) of the Social Security Act ( 42 U.S.C. 1397dd(m) ), as amended by section 3201(b) of the CHIP and Public Health Funding Extension Act (division C of Public Law 115–96 ), is amended— (1) in paragraph (2)(B)— (A) in the matter preceding clause (i), by striking (19) and inserting (31) ; and (B) in clause (ii)— (i) in the matter preceding subclause (I), by striking and paragraph (10) ; and (ii) in subclause (I), by inserting (or, in the case of fiscal year 2018, under paragraph (4)) after clause (i) ; (2) in paragraph (5), by striking , 2017, or 2018 and inserting or 2017 ; (3) in paragraph (7)— (A) in subparagraph (A), by striking and ending with fiscal year 2017