-40.8% is the change from 978 to 579
Calculation steps:
[( 579 - 978 ) ÷ 978] x 100 = -40.8%
Formula
Percentage change = [(579 - 978) / 978] x 100
Subtract the new number by the original number
579 - 978 = -399
-399 ÷ 978 = -0.40797546012269936
-0.40797546012269936 x 100 = -40.8%