-21.17% is the change from 978 to 771
Calculation steps:
[( 771 - 978 ) ÷ 978] x 100 = -21.17%
Formula
Percentage change = [(771 - 978) / 978] x 100
Subtract the new number by the original number
771 - 978 = -207
-207 ÷ 978 = -0.2116564417177914
-0.2116564417177914 x 100 = -21.17%