New table matrix data

You canuse a simple matrix visual with two measures. First, set up dimension tables for Country and Sales Type using the follwoing pattern in new tables:

Country Table = 
DISTINCT(fTable[Country])

Set up a period dimension table using the follwoing:

Period Table = 
ADDCOLUMNS(
    DISTINCT(
        fTable[Week]), 
        "WeekNum", VALUE(RIGHT(fTable[Week], 2)))

You need the WeekNum field to sort the Week field by:

Set up the model using one-to-many, single direction relationships between the dimension tables and the corresponding fields in the fact table:

Create the following two measures for the values bucket in the matrix visual:

Store Sales =
CALCULATE (
    SUM ( fTable[Sales Amount] ),
    FILTER ( 'Sales Type Table', 'Sales Type Table'[Sales Type] = "Store Sales" )
)

Web Sales =
CALCULATE (
    SUM ( fTable[Sales Amount] ),
    FILTER ( 'Sales Type Table', 'Sales Type Table'[Sales Type] = "Web Sales" )
)

Now you can set up the matrix as follows:

Sample PBIX file attached