-6.44% is the change from 978 to 915
Calculation steps:
[( 915 - 978 ) ÷ 978] x 100 = -6.44%
Formula
Percentage change = [(915 - 978) / 978] x 100
Subtract the new number by the original number
915 - 978 = -63
-63 ÷ 978 = -0.06441717791411043
-0.06441717791411043 x 100 = -6.44%