-29.65% is the change from 978 to 688
Calculation steps:
[( 688 - 978 ) ÷ 978] x 100 = -29.65%
Formula
Percentage change = [(688 - 978) / 978] x 100
Subtract the new number by the original number
688 - 978 = -290
-290 ÷ 978 = -0.2965235173824131
-0.2965235173824131 x 100 = -29.65%