From Jan 2017 to Sep 2026 the index went from 101.1 to 194.5, a change of +92.4%.
Highest reading in that period: 194.5 in Jul 2026. Lowest: 101.1 in Jan 2017.
Largest one-month rise: +22.2% in Jun 2026. Largest one-month fall: -0.5% in Feb 2024.
For a clause that resets its base every year, a 10% cap or floor would have limited the adjustment in 9 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 — Bare Printed Circuit Board Manufacturing (BLS series PCU334412334412), 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.]
Indexes the bare board substrate itself, separate from the populated assembly. A contract that only cites a chip index misses the board substrate cost, which moves on its own schedule.
Split chips from the equipment that makes them. Chip prices index to BLS PCU334413334413, which has trended down over the last decade. Fab equipment indexes to PCU333242333242, which has trended up. A shared index will misprice one side.
Let Escalake run this clause for you
Escalake tracks US PPI — Bare Printed Circuit Board Manufacturing, applies your formula, and gives both sides a number they can confirm, no spreadsheet required.