玉川ダムの貯水率 = Table.TransformColumnTypes(#"HTML から抽出されたテーブル",{{"Column1", type text}, {"Column2", type number}, {"Column3", type number}, {"Column4", type number}, {"Column5", Int64.Type}, {"Column6", type number}, {"Column7", type text}, {"Column8", type text}, {"Column9", type text}}) = Table.AddColu…