For purposes of paragraph (1)(A), the “applicable percentage” is—

(A) 1 ⁄ 12 of 1 percent in the case of an individual who first becomes eligible for an old-age insurance benefit in any calendar year before 1979;

(B) ¼ of 1 percent in the case of an individual who first becomes eligible for an old-age insurance benefit in any calendar year after 1978 and before 1987;

(C) in the case of an individual who first becomes eligible for an old-age insurance benefit in a calendar year after 1986 and before 2005, a percentage equal to the applicable percentage in effect under this paragraph for persons who first became eligible for an old-age insurance benefit in the preceding calendar year (as increased pursuant to this subparagraph), plus 1 ⁄ 24 of 1 percent if the calendar year in which that particular individual first becomes eligible for such benefit is not evenly divisible by 2; and

(D) ⅔ of 1 percent in the case of an individual who first becomes eligible for an old-age insurance benefit in a calendar year after 2004.