-97.75% is the change from 579 to 13
Calculation steps:
[( 13 - 579 ) ÷ 579] x 100 = -97.75%
Formula
Percentage change = [(13 - 579) / 579] x 100
Subtract the new number by the original number
13 - 579 = -566
-566 ÷ 579 = -0.9775474956822107
-0.9775474956822107 x 100 = -97.75%