-40.08% is the change from 978 to 586
Calculation steps:
[( 586 - 978 ) ÷ 978] x 100 = -40.08%
Formula
Percentage change = [(586 - 978) / 978] x 100
Subtract the new number by the original number
586 - 978 = -392
-392 ÷ 978 = -0.40081799591002043
-0.40081799591002043 x 100 = -40.08%