-8.15% is the change from 687 to 631
Calculation steps:
[( 631 - 687 ) ÷ 687] x 100 = -8.15%
Formula
Percentage change = [(631 - 687) / 687] x 100
Subtract the new number by the original number
631 - 687 = -56
-56 ÷ 687 = -0.08151382823871907
-0.08151382823871907 x 100 = -8.15%