-67.79% is the change from 978 to 315
Calculation steps:
[( 315 - 978 ) ÷ 978] x 100 = -67.79%
Formula
Percentage change = [(315 - 978) / 978] x 100
Subtract the new number by the original number
315 - 978 = -663
-663 ÷ 978 = -0.6779141104294478
-0.6779141104294478 x 100 = -67.79%