The term of office of members of the boards or commissions charged with the management or control of all charitable, penal or correctional institutions and institutions of higher learning of the State of Arkansas, now in existence or hereafter created, shall be five years when the membership is five in number, seven years when the membership is seven in number, and ten years when the membership is ten in number. Such terms of office shall be arranged by the General Assembly to provide a membership with one term of office expiring every year from the effective date of this amendment. The unexpired terms of members serving on the effective date of this amendment shall not be decreased.