title: Adding currency prefix to AmCharts
body: <p>Hello fellow programmers ..
  Im struggling adding a $ prefix to Amcharts
  Has anyone had any experience adding currency format to AmCharts graphs?
  So far I have tried many variations around the following with no success...</p>
  
  <pre><code>chart.numberFormatter = {
  numberFormatter = numberPrefix="$";
  };
  </code></pre>