% Change over user selected year columns

Hi all,

First time poster! I'd appreciate any help you can give me with this question...

I need to create a dynamic matrix and line chart that shows the percentage change over selected year columns. Example below.

There are 10 years in the report and a user can select any combination of years. The selected years need not be contiguous, but are displayed in order (L to R). If a user adds more years, the table recalculates to reflect all possible % changes. If only 1 year is selected you'd see a blank table/chart. I think this means that a date table may not be appropriate as I want the calculation to work over non-contiguous years.

The result I'm looking for is exactly the same as if you used a pivot table to show % Difference From (previous).

So from this:

I want this:

And this:

Happy to provide more info.

Many thanks!

Chris.