-66.16% is the change from 978 to 331
Calculation steps:
[( 331 - 978 ) ÷ 978] x 100 = -66.16%
Formula
Percentage change = [(331 - 978) / 978] x 100
Subtract the new number by the original number
331 - 978 = -647
-647 ÷ 978 = -0.6615541922290389
-0.6615541922290389 x 100 = -66.16%