title: show percentage difference with arrows in excel chart
body: <p>I have an idea in mind but no idea how to complete it or if it is even possible, therefore I ask for your help.</p>
  
  <p>I have a graph (made up) that shows an outcome of two different years and I have to look at the procentage difference for each period. </p>
  
  <p>For example, period 1: tot2016=456 and tot2017=478 then we can se that in 2017 there was 4,8% more of whatever I have to calculate, and then so on for all periods. </p>
  
  <p>I know that I can get a secondary axis to how the percentage but it just looks horrible, therefore I would like to have arrows on the bottom red and gren and corresponding percentage change for each period. Potential outcome can be seen in homemade paint picture.
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  <br><a href="https://i.stack.imgur.com/NdRvO.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NdRvO.png" alt="enter image description here"></a><br>
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  <p>Can someone please help me. Thank you :)</p>