-90.66% is the change from 867 to 81
Calculation steps:
[( 81 - 867 ) ÷ 867] x 100 = -90.66%
Formula
Percentage change = [(81 - 867) / 867] x 100
Subtract the new number by the original number
81 - 867 = -786
-786 ÷ 867 = -0.9065743944636678
-0.9065743944636678 x 100 = -90.66%