-90.71% is the change from 872 to 81
Calculation steps:
[( 81 - 872 ) ÷ 872] x 100 = -90.71%
Formula
Percentage change = [(81 - 872) / 872] x 100
Subtract the new number by the original number
81 - 872 = -791
-791 ÷ 872 = -0.9071100917431193
-0.9071100917431193 x 100 = -90.71%