code: function (formattedValue, model) {
      var tokens = formattedValue.split(this.symbol);
      if (tokens && tokens[0] && tokens[1] === "" || tokens[1] == null) {
        var rawValue = NumberFormatter.prototype.toRaw.call(this, tokens[0]);
        if (_.isUndefined(rawValue)) return rawValue;
        return rawValue / this.multiplier;
      }
    }
docs: Takes a string, possibly appended with `symbol` and/or `decimalSeparator`,
  and convert it back to a number for the model like NumberFormatter#toRaw,
  and then dividing it by `multiplier`.
  
  @member Backgrid.PercentFormatter
  @param {string} formattedData
  @param {Backbone.Model} model Used for more complicated formatting
  @return {number|undefined} Undefined if the string cannot be converted to
  a number.