How to display two date ranges in a graph?

[Massy]

Hi,

Could someone please help me, i have data with one column with dates received and one column date completed, I simply need a graph that displays the count per month for each year, i.e. 2020 jan, feb, march, april etc. 2021 jan feb, march, april etc. I also require for it to auto expand when new dates are added, I can't seem to figure out how to do it with pivot table, so I am open to any suggestions.

Thank you