title: Excel Running Total if data in current month
body: <p>I am trying to write a formula in Excel that will compare 2015 totals to 2016 totals and projections.  If there is a value in the rows for January, February, March and April, I want the 2015 sum of those same months.  Then the same for the projected</p>
  
  <p>Screen capture of excel file</p>
  
  <p><a href="https://i.stack.imgur.com/JLaHW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/JLaHW.png" alt="enter image description here"></a></p>