It is the declared policy of the general assembly to create assistant district attorney general (ADA) positions based upon the number of the ADA positions to population ratios being the primary consideration with secondary consideration being caseload when uniformly reported caseload statistics become available. The Tennessee district attorneys general conference is directed to make recommendations on this basis with the immediate objective being to achieve the following ratio: Urban and rural districts—One (1) ADA per twenty thousand (20,000) population, according to the 1990 federal census or any subsequent federal census.