-89.9% is the change from 861 to 87
Calculation steps:
[( 87 - 861 ) ÷ 861] x 100 = -89.9%
Formula
Percentage change = [(87 - 861) / 861] x 100
Subtract the new number by the original number
87 - 861 = -774
-774 ÷ 861 = -0.8989547038327527
-0.8989547038327527 x 100 = -89.9%