-5.26% is the change from 666 to 631
Calculation steps:
[( 631 - 666 ) ÷ 666] x 100 = -5.26%
Formula
Percentage change = [(631 - 666) / 666] x 100
Subtract the new number by the original number
631 - 666 = -35
-35 ÷ 666 = -0.052552552552552555
-0.052552552552552555 x 100 = -5.26%