-89.46% is the change from 863 to 91
Calculation steps:
[( 91 - 863 ) ÷ 863] x 100 = -89.46%
Formula
Percentage change = [(91 - 863) / 863] x 100
Subtract the new number by the original number
91 - 863 = -772
-772 ÷ 863 = -0.8945538818076477
-0.8945538818076477 x 100 = -89.46%