-5.71% is the change from 666 to 628
Calculation steps:
[( 628 - 666 ) ÷ 666] x 100 = -5.71%
Formula
Percentage change = [(628 - 666) / 666] x 100
Subtract the new number by the original number
628 - 666 = -38
-38 ÷ 666 = -0.057057057057057055
-0.057057057057057055 x 100 = -5.71%