-90.15% is the change from 873 to 86
Calculation steps:
[( 86 - 873 ) ÷ 873] x 100 = -90.15%
Formula
Percentage change = [(86 - 873) / 873] x 100
Subtract the new number by the original number
86 - 873 = -787
-787 ÷ 873 = -0.9014891179839634
-0.9014891179839634 x 100 = -90.15%