{"meta":{"source":"Insee","attribution":"Source : Insee, index BT, TP et divers de la construction (base 2010)","base":"2010","latestPeriod":"2026-08","publishedOn":"2026-10-16","fetchedAt":"2026-11-12T17:05:05.253Z","live":true,"stale":false,"nextPublication":{"date":"2026-11-13","confirmed":true}},"formula":"0.15+0.85*TP01","fixed":0.15,"base":"2025-03","month":"2026-08","lag":0,"coefficient":1.0613135914958238,"rounded":1.0613,"decimals":4,"rounding":"nearest","terms":[{"code":"TP01","series":"TP01","weight":0.85,"base":{"period":"2025-03","value":131.7},"current":{"period":"2026-08","value":141.2,"requested":"2026-08","substituted":false},"ratio":1.0721336370539105}],"provisional":true,"explanation":"C = 0,15 + 0,85 × TP01(2026-08) / TP01(2025-03) = 0,15 + 0,85 × 141,2 / 131,7 = 1,061314, arrondi à 1,0613"}