-39.57% is the change from 978 to 591
Calculation steps:
[( 591 - 978 ) ÷ 978] x 100 = -39.57%
Formula
Percentage change = [(591 - 978) / 978] x 100
Subtract the new number by the original number
591 - 978 = -387
-387 ÷ 978 = -0.39570552147239263
-0.39570552147239263 x 100 = -39.57%