Research

Long-run GDP and population time series for one country

Changed on

Returns the full Maddison Project Database time series for one country: GDP per capita in 2011 international dollars (PPP) and population in thousands of people, one row per year from the country's earliest observation to 2022. Country-year cells with no observation return null for both fields (the Maddison panel is 17.8% dense on average - some countries only have data from 1820 onwards, a few Western European cores reach back to year 1 AD). For regional aggregates use /regional; for the world aggregate use /world. Published under CC BY 4.0 by Bolt and van Zanden at the University of Groningen.

get/api/v1/research/maddison/country/{iso3}

Request

  • Base URL: https://sugra.ai
  • URL: https://sugra.ai/api/v1/research/maddison/country/{iso3}
  • Auth: API key in header x-api-key

Path parameters

iso3string required

ISO 3166-1 alpha-3 country code. Case-insensitive; normalised to uppercase.

Query parameters

start_yearinteger nullable

Inclusive start year (integer). Workbook range is 1 AD through 2022.

end_yearinteger nullable

Inclusive end year (integer). Defaults to the latest year in the workbook (2022).

Response

Year-ordered observations with gdppc (2011 int$) and pop (thousands) plus country metadata.

Example response

{
  "data": {
    "iso3": "USA",
    "country": "United States",
    "region": "Western Offshoots",
    "region_slug": "western-offshoots",
    "observations": [
      {
        "year": 2022,
        "gdppc": 61120.25,
        "pop": 334805
      }
    ],
    "count": 775,
    "start_year": 1820,
    "end_year": 2022
  },
  "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",
    "data_age_days": 8.532,
    "source": "sugra_crypto",
    "attribution": "Short interest and Reg SHO daily short volume data is owned by and sourced from FINRA (Financial Industry Regulatory Authority).",
    "fallback_chain": [
      "sugra_crypto",
      "sugra_finance"
    ],
    "stale_since": "2026-09-08T12:00:00Z",
    "period": "2026-Q1",
    "notes": "the UKMTO report behind these counts is dated 2026-08-21 and is 11 days old"
  }
}

Changes

  • bb59bcb0e35fRevision changes
    • info

      added the optional property // to the response with the status

    • info

      added the optional property // to the response with the status

  • d2472ec2cf81Revision changes
    • info

      added the non-success response with the status