title: Highcharts shankey diagram percentage not showing
body: <p><strong>Problem:</strong></p>
  <p>The nodeFormat works well for sum (<code>point.sum</code>), but does not work for percentage (<code>point.percentage</code>).</p>
  <p>Working <code>nodeFormat</code>:</p>
  <pre><code>nodeFormat: '{point.name} {point.sum}
  </code></pre>
  <p>Not working <code>nodeFormat</code>:</p>
  <pre><code>nodeFormat: '{point.name} {point.percentage}%'
  </code></pre>
  <p><strong>Expected output:</strong></p>
  <pre><code>China &gt;&gt; 147 (100)%
  
  US &gt;&gt; 53 (36)%
  
  EU &gt;&gt; 123 (84)%
  </code></pre>
  <p><strong>Formula for expected output:</strong></p>
  <pre><code>dataSum = 147
  chinaPercentage = chinaData/dataSum*100 = 147/147*100% = 100%
  usPercentage = usData/dataSum*100 = 53/147*100% = 36%
  euPercentage = euData/dataSum*100 = 84/147*100% = 84%
  </code></pre>
  <p>Fiddle reference:
  <a href="https://jsfiddle.net/8L75ez9n/" rel="nofollow noreferrer">https://jsfiddle.net/8L75ez9n/</a></p>