Get value from one month ago

[GraceN]

Hi! I am new to Power BI, and I want to create a measure that returns a value corresponding to the previous month. I don't want to use a slicer. I think I want to use the CALCULATE function, but I don't know how to set it up.

Here is an Excel table with dummy data. It is now December and I want the values from November. In this example, I want measures to return Previous_Month_Actual = 52 and Previous_Month_Target = 55 

Thanks for your help

Month	Actual	Target
01/31/17	5	5
02/28/17	12	10
03/31/17	18	15
04/30/17	21	20
05/31/17	25	25
06/30/17	27	30
07/31/17	30	35
08/31/17	39	40
09/30/17	44	45
10/31/17	53	50
11/30/17	52	55
12/31/17		60
01/31/18		65
02/28/18		70
03/31/18		75
04/30/18		80
05/31/18		85
06/30/18		90