-97.96% is the change from 978 to 20
Calculation steps:
[( 20 - 978 ) ÷ 978] x 100 = -97.96%
Formula
Percentage change = [(20 - 978) / 978] x 100
Subtract the new number by the original number
20 - 978 = -958
-958 ÷ 978 = -0.9795501022494888
-0.9795501022494888 x 100 = -97.96%