function cleanup(raw_data) {
        // remove unneeded columns

        var data = [];

        raw_data.forEach(function(obj){
        if (obj["County"] == "Dutchess" && obj["Month"] == 12)
            data.push(obj)
            });

        data.forEach(function(obj) {
          delete obj["2012 Census Population"];
          delete obj["Population 18+ Estimate"];
          delete obj["OPO"];
          delete obj["Location"];
          delete obj["Month"];
          delete obj["County"];
          delete obj["Chart Month"];
        });
    data.sort(function (a,b) {
        return a["Year"] > b["Year"];
    });

    return data;
  }