title: How can I create a % variance column in Excel 2010 pivot table?
body: <p>I have a Pivot table containing sales data.</p>
  
  <p>In the Rows I have sales country, in the Columns I have sales date (year) and I have the sum of the invoiced net values in the data section.</p>
  
  <p>Across the top I have two columns - '2012' and '2013' - next to these excel, by default adds a grand total column adding the two years together.</p>
  
  <p>Is there anyway that, instead of a grand total, I can show the percentage variance between 2012 and 2013?</p>