-5.18% is the change from 579 to 549
Calculation steps:
[( 549 - 579 ) ÷ 579] x 100 = -5.18%
Formula
Percentage change = [(549 - 579) / 579] x 100
Subtract the new number by the original number
549 - 579 = -30
-30 ÷ 579 = -0.05181347150259067
-0.05181347150259067 x 100 = -5.18%