# Official 2015 original-source analytical overlay

Four national missing-year observations were transcribed from visually inspected original PDF tables (page 193, Table 25; pages 123–124, Table 15). Each has an exact adjacent-year overlap with the existing reviewed chain. Page numbering is PDF, 1-based. The original publication hash is checked by the reproducible script. Rendered review pages are under qa/.

The overlay contains the full existing registry and history, plus these four observations. No frozen core inputs or raw database records are changed. Existing chain IDs are retained, so release selection must use this revision OR core, never concatenate both. Added rows use external analytical IDs in provenance, not invented raw observation IDs. All existing competing-value exclusions and the 312-ID semantic quarantine remain applicable.

These source additions increase available retrospective folds; they do not validate a 2050 extrapolation. No interpolated values, denominators, or synthetic prevalence are introduced.