(a) There shall be a chairman of the commission. The chairman shall be selected on an annual basis. The initial chairman selected under this Code section shall take office within 15 days after April 20, 1992, and shall serve for a term of office as chairman expiring January 1, 1993. Thereafter a new chairman shall take office within 15 days after the first day of January in 1993 and each subsequent year; and each such chairman shall serve for a one-year term of office as chairman.

(b) The chairman shall be selected by the members of the commission according to the following rules; and for purposes of these rules, seniority on the commission shall be determined according to the longest period of continuous unbroken service:

(1) A member of the commission with less than one year of continuous unbroken service on the commission shall not be eligible to take office as chairman;

(2) A member of the commission who has previously served as chairman shall not be eligible to serve again as chairman until each other eligible member (i.e., each other member with more than one year of continuous service on the commission) has served as chairman or has deferred service as chairman;

(3) Subject to paragraphs (1) and (2) of this subsection, the most senior member of the commission who is eligible to serve as chairman shall be selected to the office of chairman; provided, however, that such member may elect to defer service as chairman for a period of one year, at the conclusion of which year such member shall resume his place at the head of the order of rotation for the chairmanship; and

(4) If in any year the foregoing rules fail to provide for a chairman because two or more members have equal seniority, then the member to serve as chairman shall be selected by lot.

(c) Anything in subsection (b) of this Code section to the contrary notwithstanding, the members of the commission may by unanimous vote of the members select any member as chairman for any given year for a term of office as chairman as specified in subsection (a) of this Code section.

(d) The chairman shall give his entire time to the duties of his office.