{
 "schema_version": 1,
 "metric_id": "K6",
 "name": "Voter turnout (Tweede Kamer)",
 "domain": "K",
 "tier": "v1",
 "grade": "A",
 "frequency": "A",
 "harmonized_international": false,
 "caveats": "Election years only — the gaps between elections are not missing data. Compulsory attendance until 1970: pre-1971 turnout (94-96%) is not comparable with the voluntary era. Turnout = votes cast per 100 eligible voters.",
 "methodology_notes": "Entered 9 Jul 2026: 1925-2006 from CBS 37278 (discontinued 2007; 1918/1922 null there), 2010-2025 verified on verkiezingsuitslagen.nl. CBS and Kiesraad agree to 0.1pt on all overlap years. No OData successor to 37278 exists.",
 "owner_review_required": false,
 "sources": [
  {
   "org": "manual:Kiesraad",
   "dataset_code": "manual:K6",
   "url": "https://www.verkiezingsuitslagen.nl",
   "licence": "Kiesraad open data"
  }
 ],
 "breaks": [
  {
   "period": "1971",
   "note": "Compulsory attendance abolished 1970 — first voluntary election; pre-1971 levels not comparable"
  }
 ],
 "primary": {
  "key": "manual:Kiesraad|manual:K6|NL|% of eligible voters|metric=turnout_tweede_kamer",
  "dataset_code": "manual:K6",
  "source_org": "manual:Kiesraad",
  "geography": "NL",
  "unit_code": "% of eligible voters",
  "dimensions": {
   "metric": "turnout_tweede_kamer"
  },
  "frequency": "A",
  "points": [
   {
    "period": "1925",
    "value": 91.4
   },
   {
    "period": "1929",
    "value": 92.7
   },
   {
    "period": "1933",
    "value": 94.5
   },
   {
    "period": "1937",
    "value": 94.4
   },
   {
    "period": "1946",
    "value": 93.1
   },
   {
    "period": "1948",
    "value": 93.7
   },
   {
    "period": "1952",
    "value": 95.0
   },
   {
    "period": "1956",
    "value": 95.5
   },
   {
    "period": "1959",
    "value": 95.6
   },
   {
    "period": "1963",
    "value": 95.1
   },
   {
    "period": "1967",
    "value": 94.9
   },
   {
    "period": "1971",
    "value": 79.1
   },
   {
    "period": "1972",
    "value": 83.5
   },
   {
    "period": "1977",
    "value": 88.0
   },
   {
    "period": "1981",
    "value": 87.0
   },
   {
    "period": "1982",
    "value": 81.0
   },
   {
    "period": "1986",
    "value": 85.8
   },
   {
    "period": "1989",
    "value": 80.3
   },
   {
    "period": "1994",
    "value": 78.8
   },
   {
    "period": "1998",
    "value": 73.3
   },
   {
    "period": "2002",
    "value": 79.1
   },
   {
    "period": "2003",
    "value": 80.0
   },
   {
    "period": "2006",
    "value": 80.4
   },
   {
    "period": "2010",
    "value": 75.4
   },
   {
    "period": "2012",
    "value": 74.6
   },
   {
    "period": "2017",
    "value": 81.6
   },
   {
    "period": "2021",
    "value": 78.7
   },
   {
    "period": "2023",
    "value": 77.8
   },
   {
    "period": "2025",
    "value": 78.3
   }
  ]
 },
 "series": [
  {
   "key": "manual:Kiesraad|manual:K6|NL|% of eligible voters|metric=turnout_tweede_kamer",
   "dataset_code": "manual:K6",
   "source_org": "manual:Kiesraad",
   "geography": "NL",
   "unit_code": "% of eligible voters",
   "dimensions": {
    "metric": "turnout_tweede_kamer"
   },
   "frequency": "A",
   "points": [
    {
     "period": "1925",
     "value": 91.4
    },
    {
     "period": "1929",
     "value": 92.7
    },
    {
     "period": "1933",
     "value": 94.5
    },
    {
     "period": "1937",
     "value": 94.4
    },
    {
     "period": "1946",
     "value": 93.1
    },
    {
     "period": "1948",
     "value": 93.7
    },
    {
     "period": "1952",
     "value": 95.0
    },
    {
     "period": "1956",
     "value": 95.5
    },
    {
     "period": "1959",
     "value": 95.6
    },
    {
     "period": "1963",
     "value": 95.1
    },
    {
     "period": "1967",
     "value": 94.9
    },
    {
     "period": "1971",
     "value": 79.1
    },
    {
     "period": "1972",
     "value": 83.5
    },
    {
     "period": "1977",
     "value": 88.0
    },
    {
     "period": "1981",
     "value": 87.0
    },
    {
     "period": "1982",
     "value": 81.0
    },
    {
     "period": "1986",
     "value": 85.8
    },
    {
     "period": "1989",
     "value": 80.3
    },
    {
     "period": "1994",
     "value": 78.8
    },
    {
     "period": "1998",
     "value": 73.3
    },
    {
     "period": "2002",
     "value": 79.1
    },
    {
     "period": "2003",
     "value": 80.0
    },
    {
     "period": "2006",
     "value": 80.4
    },
    {
     "period": "2010",
     "value": 75.4
    },
    {
     "period": "2012",
     "value": 74.6
    },
    {
     "period": "2017",
     "value": 81.6
    },
    {
     "period": "2021",
     "value": 78.7
    },
    {
     "period": "2023",
     "value": 77.8
    },
    {
     "period": "2025",
     "value": 78.3
    }
   ]
  }
 ],
 "peers": [],
 "derived": [],
 "trend": {
  "direction": "flat",
  "method": "OLS over last 8 annual observations, 5% significance (MBW convention)",
  "window_start": "2003",
  "window_end": "2025",
  "slope_per_year": -0.018512
 },
 "deltas": {
  "latest_period": "2025",
  "latest_value": 78.3
 },
 "revisions_since": "2026-07-09",
 "generated_at": "2026-09-04T08:06:56+00:00"
}