-68.4% is the change from 978 to 309
Calculation steps:
[( 309 - 978 ) ÷ 978] x 100 = -68.4%
Formula
Percentage change = [(309 - 978) / 978] x 100
Subtract the new number by the original number
309 - 978 = -669
-669 ÷ 978 = -0.6840490797546013
-0.6840490797546013 x 100 = -68.4%