{
  "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": "ISH",
    "party_label": "維新",
    "party_label_en": "Japan Innovation Party (Ishin)",
    "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": -40.991973,
    "max_votes_change_rate_pct": 43.718772
  },
  "municipalities": [
    {
      "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",
      "baseline_votes": 2048.445,
      "target_votes": 2944.0,
      "votes_delta": 895.555,
      "votes_change_rate_pct": 43.718772,
      "baseline_vote_share_pct_muni": 4.886325,
      "target_vote_share_pct_muni": 7.212504,
      "vote_share_delta_pct_pt": 2.326179
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122181",
      "municipality_name": "勝浦市",
      "municipality_name_en": "Katsuura-shi",
      "baseline_votes": 210.0,
      "target_votes": 284.0,
      "votes_delta": 74.0,
      "votes_change_rate_pct": 35.238095,
      "baseline_vote_share_pct_muni": 3.230769,
      "target_vote_share_pct_muni": 4.229967,
      "vote_share_delta_pct_pt": 0.999198
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "123471",
      "municipality_name": "多古町",
      "municipality_name_en": "Tako-machi",
      "baseline_votes": 185.19,
      "target_votes": 245.0,
      "votes_delta": 59.81,
      "votes_change_rate_pct": 32.29656,
      "baseline_vote_share_pct_muni": 3.115579,
      "target_vote_share_pct_muni": 4.075861,
      "vote_share_delta_pct_pt": 0.960282
    },
    {
      "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": 1035.694,
      "target_votes": 1362.0,
      "votes_delta": 326.306,
      "votes_change_rate_pct": 31.506024,
      "baseline_vote_share_pct_muni": 3.863809,
      "target_vote_share_pct_muni": 5.430189,
      "vote_share_delta_pct_pt": 1.56638
    },
    {
      "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": 110.125,
      "target_votes": 144.0,
      "votes_delta": 33.875,
      "votes_change_rate_pct": 30.760499,
      "baseline_vote_share_pct_muni": 3.315021,
      "target_vote_share_pct_muni": 4.100228,
      "vote_share_delta_pct_pt": 0.785207
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "121045",
      "municipality_name": "千葉市若葉区",
      "municipality_name_en": "Wakaba-ku",
      "baseline_votes": 2851.936,
      "target_votes": 3675.0,
      "votes_delta": 823.064,
      "votes_change_rate_pct": 28.859834,
      "baseline_vote_share_pct_muni": 4.582307,
      "target_vote_share_pct_muni": 6.312698,
      "vote_share_delta_pct_pt": 1.730391
    },
    {
      "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": 522.072,
      "target_votes": 672.0,
      "votes_delta": 149.928,
      "votes_change_rate_pct": 28.717878,
      "baseline_vote_share_pct_muni": 3.362566,
      "target_vote_share_pct_muni": 4.158159,
      "vote_share_delta_pct_pt": 0.795593
    },
    {
      "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": 108.235,
      "target_votes": 139.0,
      "votes_delta": 30.765,
      "votes_change_rate_pct": 28.424262,
      "baseline_vote_share_pct_muni": 3.006528,
      "target_vote_share_pct_muni": 4.05366,
      "vote_share_delta_pct_pt": 1.047132
    },
    {
      "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": 512.5,
      "target_votes": 656.0,
      "votes_delta": 143.5,
      "votes_change_rate_pct": 28.0,
      "baseline_vote_share_pct_muni": 3.759812,
      "target_vote_share_pct_muni": 4.722822,
      "vote_share_delta_pct_pt": 0.96301
    },
    {
      "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": 108.0,
      "target_votes": 135.0,
      "votes_delta": 27.0,
      "votes_change_rate_pct": 25.0,
      "baseline_vote_share_pct_muni": 2.806653,
      "target_vote_share_pct_muni": 3.446515,
      "vote_share_delta_pct_pt": 0.639862
    },
    {
      "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",
      "baseline_votes": 654.545,
      "target_votes": 812.0,
      "votes_delta": 157.455,
      "votes_change_rate_pct": 24.055642,
      "baseline_vote_share_pct_muni": 3.664045,
      "target_vote_share_pct_muni": 4.396556,
      "vote_share_delta_pct_pt": 0.732511
    },
    {
      "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",
      "baseline_votes": 4157.208,
      "target_votes": 5018.0,
      "votes_delta": 860.792,
      "votes_change_rate_pct": 20.706012,
      "baseline_vote_share_pct_muni": 5.064146,
      "target_vote_share_pct_muni": 6.255376,
      "vote_share_delta_pct_pt": 1.19123
    },
    {
      "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": 531.568,
      "target_votes": 641.0,
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      "votes_change_rate_pct": 20.586642,
      "baseline_vote_share_pct_muni": 3.794475,
      "target_vote_share_pct_muni": 3.947287,
      "vote_share_delta_pct_pt": 0.152812
    },
    {
      "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",
      "baseline_votes": 108.428,
      "target_votes": 130.0,
      "votes_delta": 21.572,
      "votes_change_rate_pct": 19.89523,
      "baseline_vote_share_pct_muni": 3.269843,
      "target_vote_share_pct_muni": 4.032258,
      "vote_share_delta_pct_pt": 0.762415
    },
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      "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": 733.576,
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      "baseline_vote_share_pct_muni": 3.992033,
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      "vote_share_delta_pct_pt": 0.579336
    },
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      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122254",
      "municipality_name": "君津市",
      "municipality_name_en": "Kimitsu-shi",
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      "votes_delta": 229.988,
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      "baseline_vote_share_pct_muni": 4.080333,
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      "vote_share_delta_pct_pt": 0.783863
    },
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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": 242.333,
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      "vote_share_delta_pct_pt": 0.786578
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      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122173",
      "municipality_name": "柏市",
      "municipality_name_en": "Kashiwa-shi",
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      "vote_share_delta_pct_pt": 0.900851
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      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "124109",
      "municipality_name": "横芝光町",
      "municipality_name_en": "Yokoshibahikari-machi",
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      "vote_share_delta_pct_pt": 0.795726
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      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122068",
      "municipality_name": "木更津市",
      "municipality_name_en": "Kisarazu-shi",
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      "vote_share_delta_pct_pt": 0.763915
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      "prefecture_name_en": "Chiba",
      "jis_code": "124435",
      "municipality_name": "御宿町",
      "municipality_name_en": "Onjuku-machi",
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      "vote_share_delta_pct_pt": 0.399779
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      "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",
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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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      "votes_change_rate_pct": 11.686139,
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      "vote_share_delta_pct_pt": 0.611782
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      "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",
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      "baseline_vote_share_pct_muni": 4.339258,
      "target_vote_share_pct_muni": 5.008316,
      "vote_share_delta_pct_pt": 0.669058
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      "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",
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      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122378",
      "municipality_name": "山武市",
      "municipality_name_en": "Sammu-shi",
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      "votes_change_rate_pct": 9.801325,
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      "vote_share_delta_pct_pt": 0.581204
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122025",
      "municipality_name": "銚子市",
      "municipality_name_en": "Choshi-shi",
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      "votes_change_rate_pct": 8.163953,
      "baseline_vote_share_pct_muni": 3.719607,
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      "vote_share_delta_pct_pt": 0.369135
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "124095",
      "municipality_name": "芝山町",
      "municipality_name_en": "Shibayama-machi",
      "baseline_votes": 91.8,
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      "votes_change_rate_pct": 7.843137,
      "baseline_vote_share_pct_muni": 3.255319,
      "target_vote_share_pct_muni": 3.817971,
      "vote_share_delta_pct_pt": 0.562652
    },
    {
      "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",
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      "votes_delta": 10.25,
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      "baseline_vote_share_pct_muni": 3.064252,
      "target_vote_share_pct_muni": 3.40498,
      "vote_share_delta_pct_pt": 0.340728
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      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "124036",
      "municipality_name": "九十九里町",
      "municipality_name_en": "Kujukuri-machi",
      "baseline_votes": 212.0,
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      "votes_delta": 12.0,
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      "baseline_vote_share_pct_muni": 3.507031,
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      "vote_share_delta_pct_pt": 0.279951
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122130",
      "municipality_name": "東金市",
      "municipality_name_en": "Togane-shi",
      "baseline_votes": 976.379,
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      "votes_delta": 52.621,
      "votes_change_rate_pct": 5.389403,
      "baseline_vote_share_pct_muni": 3.984407,
      "target_vote_share_pct_muni": 4.468279,
      "vote_share_delta_pct_pt": 0.483872
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122360",
      "municipality_name": "香取市",
      "municipality_name_en": "Katori-shi",
      "baseline_votes": 1030.551,
      "target_votes": 1077.0,
      "votes_delta": 46.449,
      "votes_change_rate_pct": 4.507201,
      "baseline_vote_share_pct_muni": 3.515679,
      "target_vote_share_pct_muni": 3.777887,
      "vote_share_delta_pct_pt": 0.262208
    },
    {
      "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": 1438.687,
      "target_votes": 1487.0,
      "votes_delta": 48.313,
      "votes_change_rate_pct": 3.358131,
      "baseline_vote_share_pct_muni": 4.792109,
      "target_vote_share_pct_muni": 5.024328,
      "vote_share_delta_pct_pt": 0.232219
    },
    {
      "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",
      "baseline_votes": 2987.727,
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