-32.52% is the change from 978 to 660
Calculation steps:
[( 660 - 978 ) ÷ 978] x 100 = -32.52%
Formula
Percentage change = [(660 - 978) / 978] x 100
Subtract the new number by the original number
660 - 978 = -318
-318 ÷ 978 = -0.32515337423312884
-0.32515337423312884 x 100 = -32.52%