From Jan 2017 to Sep 2026 the index went from 118.8 to 165.1, a change of +38.9%.
Highest reading in that period: 179.2 in Oct 2022. Lowest: 109.4 in Dec 2020.
Largest one-month rise: +9.1% in Aug 2024. Largest one-month fall: -9.7% in Jul 2024.
For a clause that resets its base every year, a 10% cap or floor would have limited the adjustment in 20 of the last 36 months.
Use it in a contract
Draft clause citing this series
A starting point citing this series by name and code. Replace the bracketed terms with your contract's actual scope before use.
The [affected portion] of the Contract Price shall be adjusted using US PPI — Newsprint (BLS series WPU091302), published by BLS.
Base Period: the index value published for September 2026 (or the month of contract signing, if different) is the Base Value.
Adjustment: at each Adjustment Date, the Current Value is the most recently published three-month average of the index (the Averaging Window). The Escalation Factor equals Current Value divided by Base Value.
Cap: the Escalation Factor applied under this clause shall not exceed 1.10 or fall below 0.90 (a 10% cap and floor) in any single Adjustment Date, regardless of the index's actual movement.
[Replace bracketed terms with your contract's actual affected-portion definition and adjustment-date schedule before use. This is a drafting starting point, not legal advice.]
Divide the current value of the BLS series for the stage you buy (WPU0911 for wood pulp, WPU0913 for paper) by its value at contract signing, then apply that ratio to the pulp or paper part of the price. A usable clause also names an averaging window, a rule for revised values and missing months, and a cap.
Let Escalake run this clause for you
Escalake tracks US PPI — Newsprint, applies your formula, and gives both sides a number they can confirm, no spreadsheet required.