The third and fourth assistant district attorneys for the fifteenth judicial district of this state shall receive as compensation for their services, in addition to the annual salary paid by the state, such additional salary as may be provided by the parishes comprising the fifteenth judicial district, however, the compensation to be paid to the third assistant district attorney by the parish of Lafayette shall be an annual salary of not less than six thousand six hundred dollars payable monthly on his own warrant, and the compensation to be paid to the fourth assistant district attorney by the parish of Lafayette shall be an annual salary of not less than six thousand dollars payable monthly on his own warrant.
La. R.S. § 16:327