Bar Chart for Rolling12 values

[Vimarsh]

I have a monthly dataset for different years (say 2017 and 2018) and I am trying t create a chart which would show the Rolling12 number at each month of 2018.

Month	Year	Amount
Jan	2017	400
Feb	2017	200
Mar	2017	300
Apr	2017	100
May	2017	500
Jun	2017	200
Jul	2017	500
Aug	2017	300
Sep	2017	300
Oct	2017	400
Nov	2017	100
Dec	2017	100
Jan	2018	500
Feb	2018	200
Mar	2018	200
Apr	2018	400
May	2018	400
Jun	2018	300
Jul	2018	100
Aug	2018	500
Sep	2018	500
Oct	2018	200
Nov	2018	100
Dec	2018	100

I want to create a graph for just 2018 months and show sum of amount for last 12 months against each month. How can I achieve this?

Something like below

Appreciate any help here!

Thank You!