-49.8% is the change from 978 to 491
Calculation steps:
[( 491 - 978 ) ÷ 978] x 100 = -49.8%
Formula
Percentage change = [(491 - 978) / 978] x 100
Subtract the new number by the original number
491 - 978 = -487
-487 ÷ 978 = -0.49795501022494887
-0.49795501022494887 x 100 = -49.8%