Deviation Formula - Dax year wise

Anonymous , Unpivot this data have year on rows

https://radacad.com/pivot-and-unpivot-with-power-bi

then try measure like these and take diff

This Year = CALCULATE(sum('Table'[Qty]),filter(ALL('Year'),'Year'[Year]=max('Date'[Year])))
Last Year = CALCULATE(sum('Table'[Qty]),filter(ALL('Year'),'Date'[Year]=max('Date'[Year])-1))

diff = [This Year]-[Last Year ]
diff % = divide([This Year]-[Last Year ],[Last Year ])

Have year table

year = distinct(Table[year])