-84.51% is the change from 581 to 90
Calculation steps:
[( 90 - 581 ) ÷ 581] x 100 = -84.51%
Formula
Percentage change = [(90 - 581) / 581] x 100
Subtract the new number by the original number
90 - 581 = -491
-491 ÷ 581 = -0.8450946643717728
-0.8450946643717728 x 100 = -84.51%