-7.04% is the change from 668 to 621
Calculation steps:
[( 621 - 668 ) ÷ 668] x 100 = -7.04%
Formula
Percentage change = [(621 - 668) / 668] x 100
Subtract the new number by the original number
621 - 668 = -47
-47 ÷ 668 = -0.07035928143712575
-0.07035928143712575 x 100 = -7.04%