When the data changes,
the trail stays public.
When the calculated series, evidence base or method changes, we publish the date, scope and impact. Interface updates are not data releases.
Current audited data state
This is not a claim of a historical release. It is the audited starting point for the change log.
- Data identifier
0.16-derived-index-contracts- Latest source audit
- Calculated series
- 2005–2026
- Research coverage
- 1980–2026
- Dated records
- 893
- Unique calculation sources
- 509
Published data changes
Only releases that genuinely change data, evidence or methodology enter this ledger.
2026-08-31-public-historical-evidencePublic historical evidence expanded
The 1980–2004 historical ledger now contains 36 verified records and one candidate. Eleven public records were added and four public source documents are hash-pinned; 1986 reaches the two-independent-source threshold, while the unsupported 1981 city assignment is quarantined. The 2005–2026 calculated headline series is unchanged.
- Evidence
- Coverage
- Correction
Affected years: 1981, 1985, 1986, 1987, 1988, 1992, 1994, 1996, 2001Did not change the headline result
What counts as a release?
A series calculation, evidence base, methodology, year coverage or verified correction. Design and infrastructure deploys stay out of this log.
- Series
- Evidence
- Method
- Coverage
- Correction