-98.74% is the change from 637 to 8
Calculation steps:
[( 8 - 637 ) ÷ 637] x 100 = -98.74%
Formula
Percentage change = [(8 - 637) / 637] x 100
Subtract the new number by the original number
8 - 637 = -629
-629 ÷ 637 = -0.9874411302982732
-0.9874411302982732 x 100 = -98.74%