{
  "schema_version": "jp-election-municipality-proportional-swing-graph.v1",
  "dataset_id": "jp-election-db.derived-shape.graph",
  "family": "graph",
  "dataset": "municipality-proportional-swing-2025-2026",
  "source_release_version": "2026-05-03-v050",
  "selector": {
    "prefecture_code": "12",
    "prefecture_name": "千葉県",
    "prefecture_name_en": "Chiba",
    "party_id": "SAN",
    "party_label": "参政",
    "party_label_en": "Sanseito",
    "scope": "prefecture",
    "ranking_id": "",
    "ranking_label": "",
    "ranking_label_en": ""
  },
  "comparison": {
    "comparison_key": "20250720_hc_pr__20260208_hr_block",
    "baseline_election_set_key": "20250720_hc",
    "baseline_election_date": "2025-07-20",
    "baseline_vote_system": "pr",
    "target_election_set_key": "20260208_hr",
    "target_election_date": "2026-02-08",
    "target_vote_system": "block"
  },
  "metric": {
    "primary_metric_id": "votes_change_rate_pct",
    "primary_metric_label": "票数増減率",
    "secondary_metric_id": "votes_delta",
    "secondary_metric_label": "票数差"
  },
  "summary": {
    "point_grain": "municipality",
    "point_count": 60,
    "municipality_count": 60,
    "min_votes_change_rate_pct": -69.955573,
    "max_votes_change_rate_pct": -33.886407
  },
  "municipalities": [
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122343",
      "municipality_name": "南房総市",
      "municipality_name_en": "Minamiboso-shi",
      "baseline_votes": 1567.0,
      "target_votes": 1036.0,
      "votes_delta": -531.0,
      "votes_change_rate_pct": -33.886407,
      "baseline_vote_share_pct_muni": 10.092748,
      "target_vote_share_pct_muni": 6.410494,
      "vote_share_delta_pct_pt": -3.682254
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122351",
      "municipality_name": "匝瑳市",
      "municipality_name_en": "Sosa-shi",
      "baseline_votes": 1817.753,
      "target_votes": 1168.0,
      "votes_delta": -649.753,
      "votes_change_rate_pct": -35.744845,
      "baseline_vote_share_pct_muni": 12.975609,
      "target_vote_share_pct_muni": 7.192561,
      "vote_share_delta_pct_pt": -5.783048
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "124630",
      "municipality_name": "鋸南町",
      "municipality_name_en": "Kyonan-machi",
      "baseline_votes": 305.0,
      "target_votes": 195.0,
      "votes_delta": -110.0,
      "votes_change_rate_pct": -36.065574,
      "baseline_vote_share_pct_muni": 9.181216,
      "target_vote_share_pct_muni": 5.552392,
      "vote_share_delta_pct_pt": -3.628824
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122246",
      "municipality_name": "鎌ケ谷市",
      "municipality_name_en": "Kamagaya-shi",
      "baseline_votes": 6359.0,
      "target_votes": 4048.0,
      "votes_delta": -2311.0,
      "votes_change_rate_pct": -36.342192,
      "baseline_vote_share_pct_muni": 12.777543,
      "target_vote_share_pct_muni": 8.271522,
      "vote_share_delta_pct_pt": -4.506021
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "124249",
      "municipality_name": "白子町",
      "municipality_name_en": "Shirako-machi",
      "baseline_votes": 538.0,
      "target_votes": 338.0,
      "votes_delta": -200.0,
      "votes_change_rate_pct": -37.174721,
      "baseline_vote_share_pct_muni": 11.008799,
      "target_vote_share_pct_muni": 7.19302,
      "vote_share_delta_pct_pt": -3.815779
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122220",
      "municipality_name": "我孫子市",
      "municipality_name_en": "Abiko-shi",
      "baseline_votes": 8254.0,
      "target_votes": 5176.0,
      "votes_delta": -3078.0,
      "votes_change_rate_pct": -37.29101,
      "baseline_vote_share_pct_muni": 12.760497,
      "target_vote_share_pct_muni": 8.115397,
      "vote_share_delta_pct_pt": -4.6451
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122050",
      "municipality_name": "館山市",
      "municipality_name_en": "Tateyama-shi",
      "baseline_votes": 2123.0,
      "target_votes": 1330.0,
      "votes_delta": -793.0,
      "votes_change_rate_pct": -37.352803,
      "baseline_vote_share_pct_muni": 11.553113,
      "target_vote_share_pct_muni": 6.956431,
      "vote_share_delta_pct_pt": -4.596682
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122238",
      "municipality_name": "鴨川市",
      "municipality_name_en": "Kamogawa-shi",
      "baseline_votes": 1495.0,
      "target_votes": 929.0,
      "votes_delta": -566.0,
      "votes_change_rate_pct": -37.859532,
      "baseline_vote_share_pct_muni": 10.967647,
      "target_vote_share_pct_muni": 6.688265,
      "vote_share_delta_pct_pt": -4.279382
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122327",
      "municipality_name": "白井市",
      "municipality_name_en": "Shiroi-shi",
      "baseline_votes": 3781.0,
      "target_votes": 2348.0,
      "votes_delta": -1433.0,
      "votes_change_rate_pct": -37.900026,
      "baseline_vote_share_pct_muni": 12.594098,
      "target_vote_share_pct_muni": 7.933505,
      "vote_share_delta_pct_pt": -4.660593
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "123293",
      "municipality_name": "栄町",
      "municipality_name_en": "Sakae-machi",
      "baseline_votes": 1159.0,
      "target_votes": 706.0,
      "votes_delta": -453.0,
      "votes_change_rate_pct": -39.085418,
      "baseline_vote_share_pct_muni": 11.572641,
      "target_vote_share_pct_muni": 7.246972,
      "vote_share_delta_pct_pt": -4.325669
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122386",
      "municipality_name": "いすみ市",
      "municipality_name_en": "Isumi-shi",
      "baseline_votes": 1794.682,
      "target_votes": 1086.0,
      "votes_delta": -708.682,
      "votes_change_rate_pct": -39.487887,
      "baseline_vote_share_pct_muni": 11.275961,
      "target_vote_share_pct_muni": 6.928672,
      "vote_share_delta_pct_pt": -4.347289
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "121061",
      "municipality_name": "千葉市美浜区",
      "municipality_name_en": "Mihama-ku",
      "baseline_votes": 8796.0,
      "target_votes": 5209.0,
      "votes_delta": -3587.0,
      "votes_change_rate_pct": -40.7799,
      "baseline_vote_share_pct_muni": 11.437785,
      "target_vote_share_pct_muni": 6.977523,
      "vote_share_delta_pct_pt": -4.460262
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122300",
      "municipality_name": "八街市",
      "municipality_name_en": "Yachimata-shi",
      "baseline_votes": 3620.698,
      "target_votes": 2119.0,
      "votes_delta": -1501.698,
      "votes_change_rate_pct": -41.475373,
      "baseline_vote_share_pct_muni": 13.507547,
      "target_vote_share_pct_muni": 8.44829,
      "vote_share_delta_pct_pt": -5.059257
    },
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      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122335",
      "municipality_name": "富里市",
      "municipality_name_en": "Tomisato-shi",
      "baseline_votes": 2891.0,
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      "votes_change_rate_pct": -41.611899,
      "baseline_vote_share_pct_muni": 14.255424,
      "target_vote_share_pct_muni": 9.041727,
      "vote_share_delta_pct_pt": -5.213697
    },
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      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "124230",
      "municipality_name": "長生村",
      "municipality_name_en": "Chosei-mura",
      "baseline_votes": 714.0,
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      "votes_change_rate_pct": -42.016807,
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      "target_vote_share_pct_muni": 6.987342,
      "vote_share_delta_pct_pt": -4.469654
    },
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      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "124273",
      "municipality_name": "長南町",
      "municipality_name_en": "Chonan-machi",
      "baseline_votes": 345.0,
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      "baseline_vote_share_pct_muni": 9.583333,
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      "vote_share_delta_pct_pt": -3.750729
    },
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      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122319",
      "municipality_name": "印西市",
      "municipality_name_en": "Inzai-shi",
      "baseline_votes": 7180.596,
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      "vote_share_delta_pct_pt": -5.586199
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      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "121053",
      "municipality_name": "千葉市緑区",
      "municipality_name_en": "Midori-ku",
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      "vote_share_delta_pct_pt": -4.968495
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      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "124419",
      "municipality_name": "大多喜町",
      "municipality_name_en": "Otaki-machi",
      "baseline_votes": 400.0,
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      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122262",
      "municipality_name": "富津市",
      "municipality_name_en": "Futtsu-shi",
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    },
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      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122122",
      "municipality_name": "佐倉市",
      "municipality_name_en": "Sakura-shi",
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      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122076",
      "municipality_name": "松戸市",
      "municipality_name_en": "Matsudo-shi",
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      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "124222",
      "municipality_name": "睦沢町",
      "municipality_name_en": "Mutsuzawa-machi",
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    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122190",
      "municipality_name": "市原市",
      "municipality_name_en": "Ichihara-shi",
      "baseline_votes": 14995.991,
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      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122165",
      "municipality_name": "習志野市",
      "municipality_name_en": "Narashino-shi",
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      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122289",
      "municipality_name": "四街道市",
      "municipality_name_en": "Yotsukaido-shi",
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    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122106",
      "municipality_name": "茂原市",
      "municipality_name_en": "Mobara-shi",
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    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "121037",
      "municipality_name": "千葉市稲毛区",
      "municipality_name_en": "Inage-ku",
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    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "121002",
      "municipality_name": "千葉市",
      "municipality_name_en": "Chiba-shi",
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      "votes_change_rate_pct": -43.84745,
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      "vote_share_delta_pct_pt": -5.001692
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122173",
      "municipality_name": "柏市",
      "municipality_name_en": "Kashiwa-shi",
      "baseline_votes": 26986.162,
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      "votes_change_rate_pct": -43.919406,
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      "target_vote_share_pct_muni": 7.68434,
      "vote_share_delta_pct_pt": -5.569509
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122394",
      "municipality_name": "大網白里市",
      "municipality_name_en": "Oamishirasato-shi",
      "baseline_votes": 2796.0,
      "target_votes": 1565.0,
      "votes_delta": -1231.0,
      "votes_change_rate_pct": -44.027182,
      "baseline_vote_share_pct_muni": 12.352551,
      "target_vote_share_pct_muni": 7.230641,
      "vote_share_delta_pct_pt": -5.12191
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "124214",
      "municipality_name": "一宮町",
      "municipality_name_en": "Ichinomiya-machi",
      "baseline_votes": 858.0,
      "target_votes": 480.0,
      "votes_delta": -378.0,
      "votes_change_rate_pct": -44.055944,
      "baseline_vote_share_pct_muni": 14.371859,
      "target_vote_share_pct_muni": 8.244589,
      "vote_share_delta_pct_pt": -6.12727
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "121010",
      "municipality_name": "千葉市中央区",
      "municipality_name_en": "Chuo-ku",
      "baseline_votes": 12805.0,
      "target_votes": 7139.0,
      "votes_delta": -5666.0,
      "votes_change_rate_pct": -44.24834,
      "baseline_vote_share_pct_muni": 13.082212,
      "target_vote_share_pct_muni": 7.712168,
      "vote_share_delta_pct_pt": -5.370044
    },
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}
