How can I show the total usage value for the previous month on my BI report?

[Rck7]

Hi friends, 

I have created a column chart  with date slicer from (1-Feb-2017 to 20-sept- 2017) where september is my most recent/current month.  I am trying to create a label which shows the previous month Total( e.g. Month Name: Value). In this case, the label should  should show (August: 83762). Instead, the label is showing the value total of January which is not what I am looking for.

The Measure which I created is considering the previous month from the usage date selected on the slicer. How would I be able to solve this isssue? 

Chart & Measure:



Kindly, help.
Thank you.