Free sample. This preview shows 1 of 1 indicator(s) and 3 of 20 economies, and omits the share, trend, momentum and full year-by-year sections. The complete report is at GET /report/macro-gdp-deflator for a small USDC payment over x402, as HTML, JSON or CSV. A free machine-readable cross-section is at GET /preview/macro-gdp-deflator.

GDP Deflator Inflation Report — free sample

Generated: 2026-09-21T08:15:46.180Z | Range: 2015–2025 | Source: World Bank Open Data (CC BY 4.0)

Key findings

This report covers 3 economies and 1 indicator over 2015–2025, containing 33 published observations (100% of the 33 requested year × economy cells). Every figure is reproduced from World Bank Open Data and recomputed into growth, share, trend-fit, momentum, volatility, concentration and data-quality views. Values are also available as JSON and CSV from the same endpoint.

Indicator	Rank 1	Latest value	CAGR / period avg	Trend	Economies	Latest yr
Inflation, GDP deflator (annual %)	Japan	3.42	1.49%	+0.29 pp	3	2025

Inflation, GDP deflator (annual %)

Latest reading is highest in Japan at 3.42% and lowest in China at -0.92%. Period average is 1.86%, with a cross-economy spread of 4.34 percentage points. This is a rate of change rather than a level, so compound growth and a growth index are not defined for it; the trend is reported in percentage points per year. Fitted trend is steepest upward in United States (+0.31 pp/yr, percentage points per year, R² 0.304) and weakest in China (-0.26 pp/yr, R² 0.191). Largest acceleration — last three years against the three before — is United States at -114.9% percentage points. The largest covered value is 1.2× the smallest. 3 economies covered; latest observation year 2025.

Latest reading, by economy

Ranked detail

Group average over the period: 1.86%. Cross-economy spread of the latest reading: 4.34 percentage points. A rate of change has no compound growth rate, so none is reported.

#	Economy	Latest	Period avg	Trend pp/yr	Pctile
1	Japan	3.42	1.49	+0.29	100
2	United States	2.80	2.69	+0.31	67
3	China	-0.922	1.39	-0.26	33

Period average is the mean of the annual readings across the covered years. Trend pp/yr is the ordinary-least-squares slope in percentage points per year — the unit this indicator is already measured in. Percentile ranks this economy within the covered group.

Trend and dynamics

Economy	Trend pp/yr	Trend R²	Momentum	Half-period shift	Volatility	Latest YoY	Peak / trough yr	Outlier years
Japan	+0.29	0.35	-298.0%	+406.6%	610.8	+6.9%	2023 / 2018	—
United States	+0.31	0.30	-114.9%	+31.0%	84.8	+12.8%	2022 / 2015	—
China	-0.26	0.19	-274.7%	-110.5%	391.3	-20.7%	2021 / 2025	—

Trend is the ordinary-least-squares fit of value on year, reported with its R² — how much of the movement the straight line explains, in percentage points per year because this series is already a rate. Momentum is the mean change of the last three years minus the mean of the three before it, in percentage points. Half-period shift compares the second half of the window against the first. Volatility is the standard deviation of year-over-year change. Outlier years exceed 2.5 standard deviations from that economy's own average change.

Data quality

Economy	Published	Expected	Coverage	Span	Missing years
Japan	11	11	100%	2015–2025	—
United States	11	11	100%	2015–2025	—
China	11	11	100%	2015–2025	—

Full year-by-year data

Economy	2015	2016	2017	2018	2019	2020	2021	2022	2023	2024	2025
Japan	2.07	0.585	0.022	-0.119	0.783	1.23	-0.044	0.636	4.57	3.20	3.42
United States	0.928	0.950	1.79	2.29	1.65	1.34	4.56	7.11	3.70	2.48	2.80
China	0.135	1.48	4.15	3.47	1.32	0.531	4.47	1.93	-0.507	-0.764	-0.922

MethodologySeries are pulled from the official source API and null observations dropped. CAGR = (end/start)^(1/years) − 1. Index uses the first year of the range as 100. Trend is an OLS fit of value on year, reported as a percentage of the period mean alongside its R². Volatility = standard deviation of year-over-year percentage change (percentage points). Momentum compares the last three years against the three before. Share = economy value ÷ sum of the covered economies. HHI = sum of squared shares; its reciprocal estimates the number of evenly sized economies. Cross-indicator correlation is Pearson's r on pooled year-over-year changes.
CoverageRequested: 1 indicator(s) × 3 economies × 11 years = 33 cells; published: 33 (100.0%). Sparse indicators are declared in the Data quality section of each indicator.
FormatsThis document is the HTML delivery. Append ?format=json for the full structured payload (series plus every derived metric) or ?format=csv for the tidy long-format panel. The JSON schema is published at /schema/report.json.
LicenceData © World Bank Open Data (CC BY 4.0), attribution required. Generated by an automated pipeline; research reference only, not investment advice.
DisclaimerValues are reproduced as published by the source; some years may be estimates, nowcasts or subsequently revised figures. Correlations are descriptive statistics, not causal claims.