title: How to display a single series total in stackLabels
body: <p>Based on: <a href="https://stackoverflow.com/questions/8572090/how-to-position-datalabel-at-the-base-of-bar-series">How to position datalabel at the base of bar series</a></p>
  
  <p>I've made some updates so that a column chart shows a stacked column for 100%-total</p>
  
  <p><img src="https://i.stack.imgur.com/YYKrc.jpg" alt="Stacked Column"></p>
  
  <p>However, using:</p>
  
  <pre><code>stackLabels: {
          formatter: function() {
              return this.total + '%';
          },
          enabled: true,
          verticalAlign: 'middle',
          align: 'left',
          y:10
      },
  </code></pre>
  
  <p>I am getting the total 100% for the <strong>entire</strong> stack.  How can I adjust the formatter to only show the value for a single series?</p>