(1) The Department of Labor and Industry shall determine the percentage change in the Consumer Price Index for All Urban Consumers: All Items (CPI-U) for the United States City Average as published by the United States Department of Labor, Bureau of Labor Statistics, for the twelve-month period ending September 30, 2012, and for each successive twelve-month period thereafter.

(2) If the department determines that there is no positive percentage change, then no adjustment to the base amounts shall occur for the relevant time period provided for in this subsection.

(4) In each successive year in which there is a positive percentage change in the CPI-U for the United States City Average, the positive percentage change shall be multiplied by the most recent preliminary adjusted amounts, and the products shall be added to the preliminary adjusted amount of the prior year to calculate the preliminary adjusted amounts for the current year. The sums thereof shall be rounded to the nearest one hundred dollars to determine the new final adjusted base amounts for purposes of section 10.

(5) The determinations and adjustments required under this subsection shall be made in the period between October 1 and November 15 of the year following the effective date of this subsection³ and annually between October 1 and November 15 of each year thereafter.

(6) The final adjusted base amounts and new final adjusted base amounts obtained under paragraphs (3) and (4) shall become effective January 1 for the calendar year following the year in which the determination required under paragraph (1) is made.

(7) The department shall publish notice in the Pennsylvania Bulletin prior to January 1 of each calendar year of the annual percentage change determined under paragraph (1) and the unadjusted or final adjusted base amounts determined under paragraphs (3) and (4) at which competitive bidding is required under this subsection for the calendar year beginning the first day of January after publication of the notice. The notice shall include a written and illustrative explanation of the calculations performed by the department in establishing the unadjusted or final adjusted base amounts under this subsection for the ensuing calendar year.

(8) The annual increase in the preliminary adjusted base amounts obtained under paragraphs (3) and (4) shall not exceed three percent.