-79.83% is the change from 823 to 166
Calculation steps:
[( 166 - 823 ) ÷ 823] x 100 = -79.83%
Formula
Percentage change = [(166 - 823) / 823] x 100
Subtract the new number by the original number
166 - 823 = -657
-657 ÷ 823 = -0.7982989064398542
-0.7982989064398542 x 100 = -79.83%