-91.35% is the change from 821 to 71
Calculation steps:
[( 71 - 821 ) ÷ 821] x 100 = -91.35%
Formula
Percentage change = [(71 - 821) / 821] x 100
Subtract the new number by the original number
71 - 821 = -750
-750 ÷ 821 = -0.9135200974421437
-0.9135200974421437 x 100 = -91.35%