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

Population Comparison Report — free sample

Generated: 2026-09-21T08:15:17.052Z  |  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.
IndicatorRank 1Latest valueCAGR / period avg TrendEconomiesLatest yr
Total populationChina1.41B +0.2%+0.2%32025

Total population

China ranks first at 1.41B, 75.2% of the group total. Fastest compound growth over the period is United States at +0.6% per year; the slowest is Japan at -0.3%. Fitted trend is steepest upward in United States (+0.6%, per year of its own mean level, R² 0.983) and weakest in Japan (-0.3%, R² 0.928). Largest acceleration — last three years against the three before — is United States at +0.4% percentage points. Concentration is high (HHI 0.602, equivalent to 1.7 evenly sized economies). The largest covered value is 11.4× the smallest. 3 economies covered; latest observation year 2025.

Trend index (2015 = 100)

China 102 (2015=100) United States 106 (2015=100) Japan 97 (2015=100)

Share of group total, latest year

China 75.2% United States 18.3% Japan 6.6%

Ranked detail

Group total (latest year): 1.87B across 3 economies. Group median: 341.78M. Average period CAGR of the group: +0.2%. Cross-sectional dispersion: 110.0% of the group mean.
#EconomyLatest Share IndexCAGR PctileTrend
1 China 1.41B 75.2% 102+0.2% 100
2 United States 341.78M 18.3% 106+0.6% 67
3 Japan 123.37M 6.6% 97-0.3% 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

EconomyTrend %/yrTrend R² MomentumHalf-period shiftVolatility Latest YoYPeak / trough yrOutlier years
China +0.2% 0.63 -0.2% -0.5% 0.3 -0.2% 2021 / 2015 —
United States +0.6% 0.98 +0.4% +0.0% 0.2 +0.5% 2025 / 2015 —
Japan -0.3% 0.93 -0.1% -0.3% 0.2 -0.5% 2015 / 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, 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

EconomyPublishedExpectedCoverage SpanYears behind newestMissing years
China 11 11 100% 2015–2025 0 —
United States 11 11 100% 2015–2025 0 —
Japan 11 11 100% 2015–2025 0 —

Full year-by-year data

Economy20152016201720182019202020212022202320242025
China1.38B1.39B1.40B1.40B1.41B1.41B1.41B1.41B1.41B1.41B1.41B
United States321.82M324.35M326.61M328.53M330.23M331.58M332.10M334.00M336.76M340.00M341.78M
Japan127.14M127.08M126.97M126.81M126.63M126.26M125.68M125.12M124.52M123.98M123.37M
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.