-34.46% is the change from 978 to 641
Calculation steps:
[( 641 - 978 ) ÷ 978] x 100 = -34.46%
Formula
Percentage change = [(641 - 978) / 978] x 100
Subtract the new number by the original number
641 - 978 = -337
-337 ÷ 978 = -0.3445807770961145
-0.3445807770961145 x 100 = -34.46%