code: function year(options) {
      var content = ''
        , y = this.year;
  
      while(++y < this.max_year) {
        content += options.fn({
          year: y,
          selected: +this.expiration_year === y ? ' selected' : '',
        });
      }
  
      return content;
    }
docs: Handblebar helper to generate year dropdown select options.
  
  @param {Object} options
  @return {String} generated template
  @api private