-2.19% is the change from 638 to 624
Calculation steps:
[( 624 - 638 ) ÷ 638] x 100 = -2.19%
Formula
Percentage change = [(624 - 638) / 638] x 100
Subtract the new number by the original number
624 - 638 = -14
-14 ÷ 638 = -0.0219435736677116
-0.0219435736677116 x 100 = -2.19%