-5.69% is the change from 668 to 630
Calculation steps:
[( 630 - 668 ) ÷ 668] x 100 = -5.69%
Formula
Percentage change = [(630 - 668) / 668] x 100
Subtract the new number by the original number
630 - 668 = -38
-38 ÷ 668 = -0.05688622754491018
-0.05688622754491018 x 100 = -5.69%