3010.22—Calculation of less than annual limitation.
(a)
If a notice of rate adjustment is filed less than 1 year after the last Type 1-A or Type 1-B notice of rate adjustment applicable to an affected class of mail, then the annual limitation will recognize the rate increases that have occurred during the preceding 12 months. When the effects of those increases are removed, the remaining partial year limitation is the applicable restriction on rate increases.
(b)
The applicable partial year limitation is calculated in two steps. First, a simple average CPI-U index is calculated by summing the 12 most recently available monthly CPI-U values from the date the Postal Service files its notice of rate adjustment and dividing the sum by 12 (Recent Average). The partial year limitation is then calculated by dividing the Recent Average by the Recent Average from the most recent previous notice of rate adjustment (Previous Recent Average) applicable to each affected class of mail and subtracting 1 from the quotient. The result is expressed as a percentage, rounded to three decimal places.
(c)
The formula for calculating the partial year limitation for a notice of rate adjustment filed less than 1 year after the last notice is as follows: Partial Year Limitation = (Recent Average/Previous Recent Average)−1.