-80.92% is the change from 823 to 157
Calculation steps:
[( 157 - 823 ) ÷ 823] x 100 = -80.92%
Formula
Percentage change = [(157 - 823) / 823] x 100
Subtract the new number by the original number
157 - 823 = -666
-666 ÷ 823 = -0.8092345078979344
-0.8092345078979344 x 100 = -80.92%