{
  "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": "LDP",
    "party_label": "自民",
    "party_label_en": "Liberal Democratic Party",
    "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": 3.230077,
    "max_votes_change_rate_pct": 93.168536
  },
  "municipalities": [
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122270",
      "municipality_name": "浦安市",
      "municipality_name_en": "Urayasu-shi",
      "baseline_votes": 15813.652,
      "target_votes": 30547.0,
      "votes_delta": 14733.348,
      "votes_change_rate_pct": 93.168536,
      "baseline_vote_share_pct_muni": 18.368744,
      "target_vote_share_pct_muni": 36.492766,
      "vote_share_delta_pct_pt": 18.124022
    },
    {
      "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",
      "baseline_votes": 40210.954,
      "target_votes": 76487.0,
      "votes_delta": 36276.046,
      "votes_change_rate_pct": 90.214338,
      "baseline_vote_share_pct_muni": 17.991317,
      "target_vote_share_pct_muni": 34.194526,
      "vote_share_delta_pct_pt": 16.203209
    },
    {
      "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": 9218.0,
      "target_votes": 16887.0,
      "votes_delta": 7669.0,
      "votes_change_rate_pct": 83.195921,
      "baseline_vote_share_pct_muni": 18.522314,
      "target_vote_share_pct_muni": 34.506222,
      "vote_share_delta_pct_pt": 15.983908
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122203",
      "municipality_name": "流山市",
      "municipality_name_en": "Nagareyama-shi",
      "baseline_votes": 19550.91,
      "target_votes": 35670.0,
      "votes_delta": 16119.09,
      "votes_change_rate_pct": 82.446751,
      "baseline_vote_share_pct_muni": 18.929639,
      "target_vote_share_pct_muni": 35.36901,
      "vote_share_delta_pct_pt": 16.439371
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122211",
      "municipality_name": "八千代市",
      "municipality_name_en": "Yachiyo-shi",
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      "votes_change_rate_pct": 82.297342,
      "baseline_vote_share_pct_muni": 19.458629,
      "target_vote_share_pct_muni": 37.439054,
      "vote_share_delta_pct_pt": 17.980425
    },
    {
      "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",
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      "votes_delta": 8668.01,
      "votes_change_rate_pct": 81.047388,
      "baseline_vote_share_pct_muni": 20.72793,
      "target_vote_share_pct_muni": 38.80283,
      "vote_share_delta_pct_pt": 18.0749
    },
    {
      "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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      "votes_change_rate_pct": 81.032453,
      "baseline_vote_share_pct_muni": 18.828803,
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      "vote_share_delta_pct_pt": 16.410806
    },
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      "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",
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      "votes_change_rate_pct": 80.312156,
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      "vote_share_delta_pct_pt": 17.541893
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122114",
      "municipality_name": "成田市",
      "municipality_name_en": "Narita-shi",
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      "votes_change_rate_pct": 78.364828,
      "baseline_vote_share_pct_muni": 23.315522,
      "target_vote_share_pct_muni": 42.770781,
      "vote_share_delta_pct_pt": 19.455259
    },
    {
      "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",
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      "votes_change_rate_pct": 78.201572,
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      "target_vote_share_pct_muni": 47.472135,
      "vote_share_delta_pct_pt": 16.591987
    },
    {
      "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": 5993.0,
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      "votes_change_rate_pct": 76.188887,
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      "target_vote_share_pct_muni": 35.677119,
      "vote_share_delta_pct_pt": 15.715091
    },
    {
      "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",
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      "votes_change_rate_pct": 76.034214,
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      "vote_share_delta_pct_pt": 17.579247
    },
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      "prefecture_code": "12",
      "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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      "vote_share_delta_pct_pt": 16.111065
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      "prefecture_name_en": "Chiba",
      "jis_code": "122084",
      "municipality_name": "野田市",
      "municipality_name_en": "Noda-shi",
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      "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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      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
      "jis_code": "122297",
      "municipality_name": "袖ケ浦市",
      "municipality_name_en": "Sodegaura-shi",
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      "vote_share_delta_pct_pt": 18.043062
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      "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",
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      "prefecture_name_en": "Chiba",
      "jis_code": "122335",
      "municipality_name": "富里市",
      "municipality_name_en": "Tomisato-shi",
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      "prefecture_name_en": "Chiba",
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      "municipality_name": "千葉市緑区",
      "municipality_name_en": "Midori-ku",
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      "municipality_name": "八街市",
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      "municipality_name": "我孫子市",
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      "municipality_name": "千葉市花見川区",
      "municipality_name_en": "Hanamigawa-ku",
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      "jis_code": "122122",
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      "jis_code": "122254",
      "municipality_name": "君津市",
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      "municipality_name_en": "Yotsukaido-shi",
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      "jis_code": "123226",
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      "municipality_name": "千葉市若葉区",
      "municipality_name_en": "Wakaba-ku",
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      "prefecture_name_en": "Chiba",
      "jis_code": "122130",
      "municipality_name": "東金市",
      "municipality_name_en": "Togane-shi",
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      "prefecture_name_en": "Chiba",
      "jis_code": "122262",
      "municipality_name": "富津市",
      "municipality_name_en": "Futtsu-shi",
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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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      "votes_change_rate_pct": 56.002233,
      "baseline_vote_share_pct_muni": 23.907493,
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      "vote_share_delta_pct_pt": 15.096388
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    {
      "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",
      "baseline_votes": 6246.678,
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      "votes_delta": 3370.322,
      "votes_change_rate_pct": 53.95383,
      "baseline_vote_share_pct_muni": 28.174994,
      "target_vote_share_pct_muni": 44.082325,
      "vote_share_delta_pct_pt": 15.907331
    },
    {
      "prefecture_code": "12",
      "prefecture_name": "千葉県",
      "prefecture_name_en": "Chiba",
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