-19.65% is the change from 631 to 507
Calculation steps:
[( 507 - 631 ) ÷ 631] x 100 = -19.65%
Formula
Percentage change = [(507 - 631) / 631] x 100
Subtract the new number by the original number
507 - 631 = -124
-124 ÷ 631 = -0.196513470681458
-0.196513470681458 x 100 = -19.65%