-90.13% is the change from 871 to 86
Calculation steps:
[( 86 - 871 ) ÷ 871] x 100 = -90.13%
Formula
Percentage change = [(86 - 871) / 871] x 100
Subtract the new number by the original number
86 - 871 = -785
-785 ÷ 871 = -0.9012629161882894
-0.9012629161882894 x 100 = -90.13%