The district attorney of the Twenty-Second Judicial District of this state shall receive, in addition to the salary paid him by the state, in lieu of all other fees, an annual salary of seven thousand two hundred dollars, payable monthly on his own warrant, by the parishes comprising the Twenty-Second Judicial District, apportioned as follows:
(1) By the parish of Washington, the sum of three thousand six hundred dollars per annum.
(2) By the parish of St. Tammany, the sum of three thousand six hundred dollars per annum.