Create measure calculating reduction/increase rate

Anonymous add the following measures, you can always put all this in one measure but I created all these as separated measures:

Sum Value = SUM ( Diff[ Value] )

Sum First Date = 
VAR __firstDate = CALCULATE ( MIN ( Diff[ Date] ), ALLSELECTED ( Diff ) )
RETURN
CALCULATE ( [Sum Value], Diff[ Date] = __firstDate )

Sum Last Date = 
VAR __lastDate = CALCULATE ( MAX ( Diff[ Date] ), ALLSELECTED ( Diff ) )
RETURN
CALCULATE ( [Sum Value], Diff[ Date] = __lastDate )

% Diff = DIVIDE ( [Sum First Date] - [Sum Last Date], [Sum First Date] )

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