Variance of Shipment type ranging from different Dates

[powerbi_newbie]

Hello!

I am trying to calculate the variance of each tracking number base on their corresponding dates. I have been browsing tutorials and forums threads but to no afford, I still can't figure out the right measures/formula for the following data sets. I would like to know as well, how do I measure the % (percentage of each tracking number base on the shipment status on a particular day). 

Shared Axis:
Dates
Column Series:
Shipment Status
Column Value:
Tracking Numbers
Line Values:
Variance, this is what I really need a help for.

This is data sets that I have.

Sorry that I have to cover the whole tracking number.

Each tracking number is unique.
In Status_Dec(Shipment Status) there are at least 15 distinct value. In transit, On Delivery, Delivered, Exception and so on...

This is an image of my current power bi chart.  

Any help would be greatly appreciated.

[powerbi_newbie · Accepted solution]

An update to the post. 

I have already solved it. The computation was fairly simple, and had been thinking to hard to solve it, but the calculation was straight forward I just miss it, I guess.

Variace = Sum - Calculate((Sum,Previousday))

Anyway thank you!