(a) Every natural person shall have the right of reassignment of the license number issued to him during the current registration plate or digital registration plate term, for the ensuing registration plate or digital registration plate term, provided his or her application for reassignment is received in the Office of the Secretary of State on or before September 30 of the final year of the registration plate or digital registration plate term as to a vehicle registered on a calendar year, and on or before March 31 as to a vehicle registered on a fiscal year. The right of reassignment shall apply to every natural person under the staggered registration system provided the application for reassignment is received in the Office of the Secretary of State by the 1st day of the month immediately preceding the applicant's month of expiration. In addition, every natural person shall have the right of reassignment of the license number issued to him for a two-year registration, for the ensuing two-year period. Where the two-year period is for two calendar years, the application for reassignment must be received by the Secretary of State on or before September 30th of the year preceding commencement of the two-year period. Where the two-year period is for two fiscal years commencing on July 1, the application for reassignment must be received by the Secretary of State on or before April 30th immediately preceding commencement of the two-year period.