-90.73% is the change from 863 to 80
Calculation steps:
[( 80 - 863 ) ÷ 863] x 100 = -90.73%
Formula
Percentage change = [(80 - 863) / 863] x 100
Subtract the new number by the original number
80 - 863 = -783
-783 ÷ 863 = -0.9073001158748552
-0.9073001158748552 x 100 = -90.73%