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-real-gdp for a small USDC payment over x402, as HTML, JSON or CSV. A free machine-readable cross-section is at GET /preview/macro-real-gdp.

Real GDP Report (Constant Prices) — free sample

Generated: 2026-09-21T08:15:46.037Z | 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
GDP (constant 2015 US$)	United States	23.22T	+2.4%	+2.4%	3	2025

GDP (constant 2015 US$)

United States ranks first at 23.22T, 49.0% of the group total. Fastest compound growth over the period is China at +5.6% per year; the slowest is Japan at +0.5%. Fitted trend is steepest upward in China (+5.3%, per year of its own mean level, R² 0.997) and weakest in Japan (+0.4%, R² 0.432). Largest acceleration — last three years against the three before — is United States at +0.4% percentage points. Concentration is high (HHI 0.418, equivalent to 2.4 evenly sized economies). The largest covered value is 4.9× the smallest. 3 economies covered; latest observation year 2025.

Trend index (2015 = 100)

Share of group total, latest year

Ranked detail

Group total (latest year): 47.39T across 3 economies. Group median: 19.40T. Average period CAGR of the group: +2.8%. Cross-sectional dispersion: 61.7% of the group mean.

#	Economy	Latest	Share	Index	CAGR	Pctile
1	United States	23.22T	49.0%	127	+2.4%	100
2	China	19.40T	40.9%	172	+5.6%	67
3	Japan	4.76T	10.1%	105	+0.5%	33

Index = latest value as a percentage of the first year (100 = unchanged; blank for series that cross zero). CAGR is compound annual growth. Percentile ranks this economy within the covered group.

Trend and dynamics

Economy	Trend %/yr	Trend R²	Momentum	Half-period shift	Volatility	Latest YoY	Peak / trough yr	Outlier years
United States	+2.4%	0.97	+0.4%	+1.8%	2.0	+2.2%	2025 / 2015	—
China	+5.3%	1.00	+0.4%	-0.4%	1.9	+5.0%	2025 / 2015	—
Japan	+0.4%	0.43	+0.3%	+1.6%	2.0	+1.2%	2025 / 2020	—

Trend is the ordinary-least-squares fit of value on year, reported with its R² — how much of the movement the straight line explains, as a percentage of the period mean level so economies of different size are comparable. 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
United States	11	11	100%	2015–2025	—
China	11	11	100%	2015–2025	—
Japan	11	11	100%	2015–2025	—

Full year-by-year data

Economy	2015	2016	2017	2018	2019	2020	2021	2022	2023	2024	2025
United States	18.30T	18.63T	19.09T	19.65T	20.16T	19.74T	20.95T	21.48T	22.11T	22.73T	23.22T
China	11.28T	12.04T	12.87T	13.75T	14.58T	14.92T	16.20T	16.71T	17.61T	18.48T	19.40T
Japan	4.53T	4.57T	4.64T	4.68T	4.66T	4.47T	4.62T	4.69T	4.72T	4.71T	4.76T

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.