-34.87% is the change from 978 to 637
Calculation steps:
[( 637 - 978 ) ÷ 978] x 100 = -34.87%
Formula
Percentage change = [(637 - 978) / 978] x 100
Subtract the new number by the original number
637 - 978 = -341
-341 ÷ 978 = -0.3486707566462168
-0.3486707566462168 x 100 = -34.87%