subsection (a) or disability insurance benefits under section 223. (3) (A) The increase required under paragraph (1) with respect to the monthly insurance benefit of an individual who is a qualified beneficiary for a calendar year shall be equal to the applicable percentage (specified for such benefit in subparagraph (B)) of the full increase amount for such calendar year (determined under subparagraph (C)). (B) The applicable percentage specified for a monthly insurance benefit under this subparagraph for a calendar year is the percentage specified, in connection with the number of years ending after the applicable date of eligibility for such individual and before such calendar year, in the following table: The applicable If the number of years is: percentage is: 16 20 percent 17 40 percent 18 60 percent 19 80 percent 20 or larger 100 percent. (C) (i) Except as provided in clause (ii), the full increase amount determined under this subparagraph for a calendar year in connection with the monthly insurance benefit of a qualified beneficiary is a dollar amount equal to 5 percent of the amount of the benefit if— (I) such benefit were based on the primary insurance amount determined for January of such calendar year of a putative individual