-48.51% is the change from 637 to 328
Calculation steps:
[( 328 - 637 ) ÷ 637] x 100 = -48.51%
Formula
Percentage change = [(328 - 637) / 637] x 100
Subtract the new number by the original number
328 - 637 = -309
-309 ÷ 637 = -0.4850863422291994
-0.4850863422291994 x 100 = -48.51%