-84.28% is the change from 579 to 91
Calculation steps:
[( 91 - 579 ) ÷ 579] x 100 = -84.28%
Formula
Percentage change = [(91 - 579) / 579] x 100
Subtract the new number by the original number
91 - 579 = -488
-488 ÷ 579 = -0.842832469775475
-0.842832469775475 x 100 = -84.28%