(a) Compensation to which a member of a county governing authority is entitled under general or local law, including amounts provided for in Code Sections 36-5-27 and 36-5-28 shall be increased by multiplying said amounts by the percentage which equals 2.5 percent times the number of completed, four-year terms of office served by such member of a county governing authority where such terms have been completed after December 31, 2004, effective the first day of January following the completion of each such period of service.
(b) For a member of a county governing authority elected to two-year terms of office or six-year terms of office, the percentage increase provided for in subsection (a) of this Code section shall be 1.25 percent times the number of completed two-year terms or 3.75 percent times the number of completed six-year terms as applicable.