I have Odoo 8 installed and working. I would like to build a graph view where I can compare the invoiced total for each month with the correspondent of the previous year. But I am a bit lost on how to do that, as I see those values are calculated on the fly.
on the row:
on the columns:
Jan 2017 | Jan 2016 | Difference % | and so on
Is there some module that do the same already built?
Or, what is the best way to achieve so?