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Beginning January 1, 1990 and until July 1, 2019, the rate of tax imposed in this paragraph, including the tax on compressed natural gas, shall be 19 cents per gallon. Beginning July 1, 2019 and until July 1, 2020, the rate of tax imposed in this paragraph shall be 38 cents per gallon. Beginning July 1, 2020 and until July 1, 2021, the rate of tax imposed in this paragraph shall be 38.7 cents per gallon. Beginning July 1, 2021 and until January 1, 2023, the rate of tax imposed in this paragraph shall be 39.2 cents per gallon. On January 1, 2023, the rate of tax imposed in this paragraph shall be increased by an amount equal to the percentage increase, if any, in the Consumer Price Index for the 12 months ending in September of 2022. On July 1, 2023, and on July 1 of each subsequent year, except for the time period beginning July 1, 2026, and ending on January 1, 2027, the rate of tax imposed in this paragraph shall be increased by an amount equal to the percentage increase, if any, in the Consumer Price Index for the 12 months ending in March of the year in which the increase takes place. The percentage increase in the Consumer Price Index shall be calculated as follows: (1) calculate the average Consumer Price Index for the full 12 months ending in March of the year in which the increase takes place; (2) calculate the average Consumer Price Index for the full 12 months ending in March of the year immediately preceding the year in which the increase takes place; (3) calculate the percentage increase, if any, in the current-year average determined under item (1) over the SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468