-90.1% is the change from 869 to 86
Calculation steps:
[( 86 - 869 ) ÷ 869] x 100 = -90.1%
Formula
Percentage change = [(86 - 869) / 869] x 100
Subtract the new number by the original number
86 - 869 = -783
-783 ÷ 869 = -0.9010356731875719
-0.9010356731875719 x 100 = -90.1%