-90.01% is the change from 861 to 86
Calculation steps:
[( 86 - 861 ) ÷ 861] x 100 = -90.01%
Formula
Percentage change = [(86 - 861) / 861] x 100
Subtract the new number by the original number
86 - 861 = -775
-775 ÷ 861 = -0.9001161440185831
-0.9001161440185831 x 100 = -90.01%