the combined level of its supplementary payments (to recipients of the type involved) and the amounts payable (to or on behalf of such recipients) under
section 1382(b) of this title and
[section 211(a)(1)(A) of Public Law 93–66], for March 1983, increased by the amount of all cost-of-living adjustments under
section 1382f of this title (and any other benefit increases under this subchapter) which have occurred after March 1983 and before that particular month.