-89.9% is the change from 822 to 83
Calculation steps:
[( 83 - 822 ) ÷ 822] x 100 = -89.9%
Formula
Percentage change = [(83 - 822) / 822] x 100
Subtract the new number by the original number
83 - 822 = -739
-739 ÷ 822 = -0.8990267639902676
-0.8990267639902676 x 100 = -89.9%