-90.52% is the change from 854 to 81
Calculation steps:
[( 81 - 854 ) ÷ 854] x 100 = -90.52%
Formula
Percentage change = [(81 - 854) / 854] x 100
Subtract the new number by the original number
81 - 854 = -773
-773 ÷ 854 = -0.905152224824356
-0.905152224824356 x 100 = -90.52%