-83.6% is the change from 823 to 135
Calculation steps:
[( 135 - 823 ) ÷ 823] x 100 = -83.6%
Formula
Percentage change = [(135 - 823) / 823] x 100
Subtract the new number by the original number
135 - 823 = -688
-688 ÷ 823 = -0.8359659781287971
-0.8359659781287971 x 100 = -83.6%