-67.28% is the change from 978 to 320
Calculation steps:
[( 320 - 978 ) ÷ 978] x 100 = -67.28%
Formula
Percentage change = [(320 - 978) / 978] x 100
Subtract the new number by the original number
320 - 978 = -658
-658 ÷ 978 = -0.6728016359918201
-0.6728016359918201 x 100 = -67.28%