(1) Such members shall pay a contribution of 1 1/2 percent per year on compensation received for each such year plus 4 1/2 percent interest on such employee contributions, compounded annually to the date of payment; and
(2) An amount shall be paid to the retirement system from funds appropriated or otherwise available for the operation of the judicial branch of state government in an amount equal to the normal employer contribution which would have been paid on behalf of the member if the member had been a member of the retirement system during the period for which service is granted plus 4 1/2 percent interest on such employer contributions, compounded annually to the date of payment;