-29.86% is the change from 978 to 686
Calculation steps:
[( 686 - 978 ) ÷ 978] x 100 = -29.86%
Formula
Percentage change = [(686 - 978) / 978] x 100
Subtract the new number by the original number
686 - 978 = -292
-292 ÷ 978 = -0.2985685071574642
-0.2985685071574642 x 100 = -29.86%