-90.19% is the change from 826 to 81
Calculation steps:
[( 81 - 826 ) ÷ 826] x 100 = -90.19%
Formula
Percentage change = [(81 - 826) / 826] x 100
Subtract the new number by the original number
81 - 826 = -745
-745 ÷ 826 = -0.9019370460048426
-0.9019370460048426 x 100 = -90.19%