{"dataset":"cpi-jp","release":{"release_id":342,"label":"Data through September 2026","latest_period":"2026-09-01","ingested_at":"2026-10-23T13:00:15.079829Z","sha256":"29b63b7aa5cba598b6ab9d7fff839094a5068004bcd571afd20344e14e847c41","download_url":"https://www.e-stat.go.jp/stat-search/file-download?statInfId=000040482943&fileKind=1","retrieved_at":"2026-10-23T13:00:15.079829Z","source_name":"CPI Japan, national, Table 1: middle-class indices (Jan 1970 – latest month), 2025 base","source_page":"https://www.e-stat.go.jp/stat-search/files?stat_infid=000040482943","source_id":"e-stat:000040482943","base":"2025=100","frequency":"monthly","published_at":null,"status":"published","known_at":"2026-10-23T13:00:15.079829Z","known_at_basis":"our fetch","coverage_start":"1970-01-01"},"count":1,"query":"electricity","notes_calc":"step: the 12-month move is decomposed into its 12 monthly log changes; raised when the largest single month is at least 70% of the summed absolute change and moved the index by at least 10%. low_base: raised when the latest index level is below 5.0 (base year = 100). Both are calculated from published index values.","contrib_calc":"contribution[g,t] = weight[g] × (index[g,t] − index[g,t−12]) / (10000 × headline_index[t−12]) × 100, in percentage points. Group contributions sum to headline YoY up to a small residual from the rounding of published indices and weights.","series":[{"code":"0056","name_en":"Electricity","name_ja":"電気代","weight":376.0,"as_of":"2026-09-01","index":92.5,"prev_index":94.3,"yoy":-2.3231256599788863,"mom":-1.9088016967126142,"ann3m":-35.45714951195191,"yoy_prior":3.1590413943355156,"contrib_pp":-0.08263736263736275,"discontinued":false,"spark":[["2021-09-01",86.9],["2021-10-01",88.2],["2021-11-01",89.6],["2021-12-01",90.8],["2022-01-01",92.3],["2022-02-01",95.3],["2022-03-01",97.6],["2022-04-01",98.6],["2022-05-01",99.7],["2022-06-01",100.2],["2022-07-01",102.3],["2022-08-01",104.1],["2022-09-01",105.6],["2022-10-01",106.7],["2022-11-01",107.6],["2022-12-01",110.1],["2023-01-01",110.9],["2023-02-01",90.1],["2023-03-01",89.3],["2023-04-01",89.4],["2023-05-01",82.7],["2023-06-01",87.8],["2023-07-01",85.3],["2023-08-01",82.3],["2023-09-01",79.7],["2023-10-01",88.8],["2023-11-01",88.1],["2023-12-01",87.5],["2024-01-01",87.6],["2024-02-01",87.8],["2024-03-01",88.4],["2024-04-01",88.5],["2024-05-01",94.8],["2024-06-01",99.6],["2024-07-01",104.4],["2024-08-01",103.9],["2024-09-01",91.8],["2024-10-01",92.3],["2024-11-01",96.8],["2024-12-01",103.9],["2025-01-01",103.4],["2025-02-01",95.7],["2025-03-01",96.1],["2025-04-01",100.4],["2025-05-01",105.5],["2025-06-01",105.0],["2025-07-01",103.7],["2025-08-01",96.7],["2025-09-01",94.7],["2025-10-01",95.6],["2025-11-01",101.6],["2025-12-01",101.5],["2026-01-01",101.6],["2026-02-01",88.1],["2026-03-01",88.4],["2026-04-01",97.8],["2026-05-01",103.0],["2026-06-01",103.2],["2026-07-01",103.6],["2026-08-01",94.3],["2026-09-01",92.5]],"notes":[]}]}