-6.59% is the change from 668 to 624
Calculation steps:
[( 624 - 668 ) ÷ 668] x 100 = -6.59%
Formula
Percentage change = [(624 - 668) / 668] x 100
Subtract the new number by the original number
624 - 668 = -44
-44 ÷ 668 = -0.0658682634730539
-0.0658682634730539 x 100 = -6.59%