-86.3% is the change from 584 to 80
Calculation steps:
[( 80 - 584 ) ÷ 584] x 100 = -86.3%
Formula
Percentage change = [(80 - 584) / 584] x 100
Subtract the new number by the original number
80 - 584 = -504
-504 ÷ 584 = -0.863013698630137
-0.863013698630137 x 100 = -86.3%