-9.3% is the change from 978 to 887
Calculation steps:
[( 887 - 978 ) ÷ 978] x 100 = -9.3%
Formula
Percentage change = [(887 - 978) / 978] x 100
Subtract the new number by the original number
887 - 978 = -91
-91 ÷ 978 = -0.09304703476482618
-0.09304703476482618 x 100 = -9.3%