Comparing data with selected months and previous months

Hello,

I have a table called customer Transaction . Please find sample data as below. It has many rows with other cust id, year and month.

I want to select year and month through Slicer and calculate New customers sales and no sales customers.

For Example if I select year= 2019 and Month = FEB, result should display as below after comparing previous month. I used calculated table, its working hard code value but not through slicer.

Please Help!!!!!!!

Customers removed this month

Regards

Samar