lass="card" id="chartContainer">
          <h1 class="title">Product Order Statistics</h1>
          <google-chart id="column" type="column" options="[[columnOptions]]" cols='[[columnItems]]' rows='[[rowItems]]'></google-chart>
          <div class="center">
            <paper-button class="btn" on-click="resetOrderStatistic">Reset Order Statistics</paper-button>
          </div>
        </div>
      </li>
      <li>
        <div class="card">
          <h1 class="title">Overall Working Statistics</h1>
    