-35.48% is the change from 978 to 631
Calculation steps:
[( 631 - 978 ) ÷ 978] x 100 = -35.48%
Formula
Percentage change = [(631 - 978) / 978] x 100
Subtract the new number by the original number
631 - 978 = -347
-347 ÷ 978 = -0.35480572597137017
-0.35480572597137017 x 100 = -35.48%