Week on Week Variance by Number and Percentage

[Enrico501]

Hi How do I calculate the Variance as a percentage and number wise Week on Week and Show the result in the format below? 

This is a Matrix Visual  using Country as Rows, Fiscal Weeks as Columns for a total volume of Items as the values

The result I am after is 

Canada -501 for between weeks 3 & 4 

Canada -23.44% for between week 3  & 4 etc, etc.

An help on how to caculate this as a measure or extra column will be greatly appreciated. 

Thanks.

[lbendlin]

what should happen in week 1?

Please provide sample data that covers your issue or question completely, in a usable format (not as a screenshot).
https://community.powerbi.com/t5/Community-Blog/How-to-provide-sample-data-in-the-Power-BI-Forum/ba-...
Please show the expected outcome based on the sample data you provided.

https://community.powerbi.com/t5/Desktop/How-to-Get-Your-Question-Answered-Quickly/m-p/1447523

[Enrico501]

Hi, 

I can't go back to week 1 because this is a data feed that only goes back a certain period. 

However, visual is a Matrix and the Visuals with the variance in that I and trying to create are also Matrix visual but with Variance between the weeks by Num or by % changes up or down re the example in the orginal request. 

Kind Regards