-19.56% is the change from 823 to 662
Calculation steps:
[( 662 - 823 ) ÷ 823] x 100 = -19.56%
Formula
Percentage change = [(662 - 823) / 823] x 100
Subtract the new number by the original number
662 - 823 = -161
-161 ÷ 823 = -0.19562575941676794
-0.19562575941676794 x 100 = -19.56%