World GDP per capita and population aggregate time series

GET

/api/v1/research/maddison/world

Last modified:2026-07-19 17:02:26

Maintainer:Not configured

OperationId:research_maddison_world

Returns the world aggregate series from the Maddison Project's Regional data sheet. Covers world GDP per capita in 2011 international dollars (PPP) and world population in thousands of people. The Maddison world aggregate is population-weighted across the member countries where data are available. Pre-1950 observations land on the Maddison milestone year grid (1820, 1830, 1840, 1870, 1890, 1900, 1913, 1929, 1938); annual from 1950 through 2022. Do not assume uniform spacing before 1950. Published under CC BY 4.0 by Bolt and van Zanden at the University of Groningen.

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x-api-key: ********************

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Dart

curl --location 'https://sugra.ai/api/v1/research/maddison/world?start_year=1820&end_year=2022' \
--header 'x-api-key: <api-key>'

Responses

🟢200OK

application/json

Year-ordered world observations with gdppc and pop.

Bodyapplication/json

Example

{
    "data": {
        "region": "World",
        "observations": [
            {
                "year": 2022,
                "gdppc": 0,
                "pop": 0
            }
        ],
        "count": 78,
        "start_year": 0,
        "end_year": 0
    },
    "meta": {
        "endpoint": "/api/v1/fred/us/cpi",
        "data_time": "2026-04-16T14:30:00Z",
        "response_time": "2026-04-16T14:30:12Z",
        "provider": "Sugra API v1.0.1",
        "source": "string",
        "attribution": "string",
        "fallback_used": true,
        "fallback_chain": [
            "string"
        ],
        "cached": true,
        "stale": true
    }
}

🟠401Unauthorized

🟠422Parameter Error

🟠429

🔴503Service Unavailable

Modified at 2026-07-19 17:02:26

Long-run GDP and population time series for one country

Regional GDP per capita and population for all 8 Maddison regions