-80.51% is the change from 821 to 160
Calculation steps:
[( 160 - 821 ) ÷ 821] x 100 = -80.51%
Formula
Percentage change = [(160 - 821) / 821] x 100
Subtract the new number by the original number
160 - 821 = -661
-661 ÷ 821 = -0.805115712545676
-0.805115712545676 x 100 = -80.51%