For purposes of determining under paragraph (1) whether a State’s expenditures for supplementary payments in the 12-month period beginning on the effective date of any increase in the level of supplemental security income benefits are not less than the State’s expenditures for such payments in the preceding 12-month period, the Commissioner of Social Security, in computing the State’s expenditures, shall disregard, pursuant to a 1-time election of the State, all expenditures by the State for retroactive supplementary payments that are required to be made in connection with the retroactive supplemental security income benefits referred to in section 5041 of the Omnibus Budget Reconciliation Act of 1990.