(a) The annual salary of the County Treasurer of St. Mary’s County is:
(1) $50,000 for calendar year 2015;
(2) $50,500 for calendar year 2016;
(3) $51,005 for calendar year 2017; and
(4) $63,000 for calendar year 2018.
(b) The County Treasurer of St. Mary’s County shall devote full time to the duties of office.