-33.74% is the change from 978 to 648
Calculation steps:
[( 648 - 978 ) ÷ 978] x 100 = -33.74%
Formula
Percentage change = [(648 - 978) / 978] x 100
Subtract the new number by the original number
648 - 978 = -330
-330 ÷ 978 = -0.3374233128834356
-0.3374233128834356 x 100 = -33.74%