-29.75% is the change from 978 to 687
Calculation steps:
[( 687 - 978 ) ÷ 978] x 100 = -29.75%
Formula
Percentage change = [(687 - 978) / 978] x 100
Subtract the new number by the original number
687 - 978 = -291
-291 ÷ 978 = -0.29754601226993865
-0.29754601226993865 x 100 = -29.75%