-90.64% is the change from 865 to 81
Calculation steps:
[( 81 - 865 ) ÷ 865] x 100 = -90.64%
Formula
Percentage change = [(81 - 865) / 865] x 100
Subtract the new number by the original number
81 - 865 = -784
-784 ÷ 865 = -0.9063583815028902
-0.9063583815028902 x 100 = -90.64%