-84.46% is the change from 579 to 90
Calculation steps:
[( 90 - 579 ) ÷ 579] x 100 = -84.46%
Formula
Percentage change = [(90 - 579) / 579] x 100
Subtract the new number by the original number
90 - 579 = -489
-489 ÷ 579 = -0.844559585492228
-0.844559585492228 x 100 = -84.46%