Section 2
SEC. 2. Beginning with the year nineteen hundred and fifty-one and for each period of five consecutive years after said date, the President of the Philippines shall order the classification of the provinces and municipalities in accordance with the graduated amounts established in section two thousand one hundred seventy of the Administrative Code, as amended, Commonwealth Act Numbered Two hundred ninety-eight, and section one of Act Numbered Three thousand seven hundred ninety-eight: Provided, That whenever advisable in the public interest, the President of the Philippines may, before and after said date, make a partial readjustment of the classification of a province or municipality based on the average annual revenues of such province or municipality for any preceding three consecutive fiscal years in accordance with the graduated amounts.