-81.36% is the change from 821 to 153
Calculation steps:
[( 153 - 821 ) ÷ 821] x 100 = -81.36%
Formula
Percentage change = [(153 - 821) / 821] x 100
Subtract the new number by the original number
153 - 821 = -668
-668 ÷ 821 = -0.8136419001218027
-0.8136419001218027 x 100 = -81.36%