plus (II) a percentage increase in the previous year’s tax rate equal to the increase in the Consumer Price Index for the previous calendar year. (C) Consumer Price Index for any calendar year For purposes of subparagraph (B), the Consumer Price Index for the previous calendar year is the average of the Consumer Price Index for all-urban consumers published by the Department of Labor as of the close of the 12-month period ending on August 31 of such calendar year. For purposes of the preceding sentence, the revision of the Consumer Price Index which is most consistent with the Consumer Price Index for calendar year 1986 shall be used. (3) Rate adjustment based on emission levels (A) Report Not later than March 30, 2021, and annually thereafter, the Secretary and the Administrator shall jointly report the emissions during the calendar year ending on the preceding December 31 from sources subject to taxation under this part. The report shall determine whether the cumulative amount of annual emissions reported for the period beginning in calendar year 2020 and through the end of the preceding calendar year were less than the emissions levels specified in the following schedule: (i) The total emissions through calendar year 2020 are 5,177 million metric tons of carbon dioxide equivalent. (ii) The total emissions through calendar year 2021 are 10,353 million metric tons of carbon dioxide equivalent. (iii) The total emissions through calendar year 2022 are 15,472 million metric tons of carbon dioxide equivalent. (iv) The total emissions through calendar year 2023 are 20,532 million metric tons of carbon dioxide equivalent. (v) The total emissions through calendar year 2024 are 25,592 million metric tons of carbon dioxide equivalent. (vi) The total emissions through calendar year 2025 are 30,594 million metric tons of carbon dioxide equivalent. (vii) The total emissions through calendar year 2026 are 35,596 million metric tons of carbon dioxide equivalent. (viii) The total emissions through calendar year 2027 are