Any county may adopt or readopt this article alone from time to time, adopt Article 16.5 alone, or adopt this article and Article 16.5 at the same time or different times. If both articles are adopted, any accumulated increases in excess of three percent (3%) per year which are accumulated under this article shall be applicable to the computation of future allowance adjustments as provided in Article 16.5 and any allowance which is increased as provided in this article shall be subject to future increase or decrease as provided in Article 16. 5.