-81.04% is the change from 823 to 156
Calculation steps:
[( 156 - 823 ) ÷ 823] x 100 = -81.04%
Formula
Percentage change = [(156 - 823) / 823] x 100
Subtract the new number by the original number
156 - 823 = -667
-667 ÷ 823 = -0.81044957472661
-0.81044957472661 x 100 = -81.04%