Table % Change from Previous Row

Here's the solution I developed combining various sources I found. It may not be the most condensed but it works:

Units % Changed = 
VAR CurrentRowDate = MAX(MYTABLE[Year])
var currentUnits = CALCULATE(
                                SUM(MYTABLE[Units]),
                                FILTER(
                                    ALLSELECTED(MYTABLE),
                                    MYTABLE[Year] = CurrentRowDate))

VAR previousUnits =
    CALCULATE(
        SUM(MYTABLE[Units]),
        FILTER(
            ALLSELECTED(MYTABLE),
            MYTABLE[Year] 
                = CALCULATE (
                    MAX(MYTABLE[Year]),
                    FILTER(ALLSELECTED(MYTABLE), MYTABLE[Year] < CurrentRowDate)
                )
        )
    )
var percentChanged = (currentUnits - previousUnits) / previousUnits 
RETURN IF(ISBLANK(previousUnits), BLANK(),percentChanged)