Calculating value differences for each week

Here is one way to do this one to get the result below.

First you need to add a column in query or with a DAX column to get the weeknumber as an integer.  You can then use these measure expressions (they differ only in the Return part).  The IF in the Return of the New Pass measure is to prevent a result of 2 showing in WW35.

New Pass =
VAR thisweek =
    MAX ( Availability[WeekNumber] )
VAR summary =
    ADDCOLUMNS (
        VALUES ( Availability[Machine] ),
        "@ThisWeek",
            CALCULATE (
                COUNT ( Availability[Machine] ),
                Availability[Availability] > 0.9,
                Availability[WeekNumber] = thisweek
            ) + 0,
        "@LastWeek",
            CALCULATE (
                COUNT ( Availability[Machine] ),
                Availability[Availability] > 0.9,
                ALL (
                    Availability[WeekNumber],
                    Availability[WorkWeek]
                ),
                Availability[WeekNumber] = thisweek - 1
            ) + 0
    )
RETURN
    IF (
        thisweek
            = CALCULATE (
                MIN ( Availability[WeekNumber] ),
                ALL ( Availability )
            ),
        BLANK (),
        COUNTROWS (
            FILTER (
                summary,
                [@ThisWeek] - [@LastWeek] = 1
            )
        )
    )

New Fail =
VAR thisweek =
    MAX ( Availability[WeekNumber] )
VAR summary =
    ADDCOLUMNS (
        VALUES ( Availability[Machine] ),
        "@ThisWeek",
            CALCULATE (
                COUNT ( Availability[Machine] ),
                Availability[Availability] > 0.9,
                Availability[WeekNumber] = thisweek
            ) + 0,
        "@LastWeek",
            CALCULATE (
                COUNT ( Availability[Machine] ),
                Availability[Availability] > 0.9,
                ALL (
                    Availability[WeekNumber],
                    Availability[WorkWeek]
                ),
                Availability[WeekNumber] = thisweek - 1
            ) + 0
    )
RETURN
    COUNTROWS (
        FILTER (
            summary,
            [@ThisWeek] - [@LastWeek] = -1
        )
    )

Steady =
VAR thisweek =
    MAX ( Availability[WeekNumber] )
VAR summary =
    ADDCOLUMNS (
        VALUES ( Availability[Machine] ),
        "@ThisWeek",
            CALCULATE (
                COUNT ( Availability[Machine] ),
                Availability[Availability] > 0.9,
                Availability[WeekNumber] = thisweek
            ) + 0,
        "@LastWeek",
            CALCULATE (
                COUNT ( Availability[Machine] ),
                Availability[Availability] > 0.9,
                ALL (
                    Availability[WeekNumber],
                    Availability[WorkWeek]
                ),
                Availability[WeekNumber] = thisweek - 1
            ) + 0
    )
RETURN
    COUNTROWS (
        FILTER (
            summary,
            [@ThisWeek] - [@LastWeek] = 0
                && [@ThisWeek] = 1
        )
    )

Regards,

Pat