You could create a year ago measure to achieve this, or, if you are set on your pivot table course then you can make calculations by referencing the columns in a newly created calculated column; -
“($1 - $2) / $2”
Hope this helps?
how to create calculated column for measures in pivot view?
i tried to create calculated column for measure it is saying cannot be created for measures.
My example syntax assumes that your years are laid out in columns and the year 2016 is in column 1 and 2015 in column 2.
On pivot table calculations you would do it as follows; -
To create a calculated item for a dimension column (in your case I am guessing something like Time.Year)
Click on the “More options” button for the dimension column
Choose “New Calculated Item”
Populate with the formula as previously supplied.