-83.48% is the change from 823 to 136
Calculation steps:
[( 136 - 823 ) ÷ 823] x 100 = -83.48%
Formula
Percentage change = [(136 - 823) / 823] x 100
Subtract the new number by the original number
136 - 823 = -687
-687 ÷ 823 = -0.8347509113001215
-0.8347509113001215 x 100 = -83.48%