Sec. 12. The Indiana judges' retirement fund is established and consists of:
(1) each participant's contribution to the fund;
(2) gifts, grants, devises, and bequests in money, property, or other forms made to the fund;
(3) interest on investments or on deposits of the funds; and
(4) contributions or payments to the fund made in the manner provided by the general assembly, including appropriations from the state general fund as provided by this chapter.