-4.08% is the change from 638 to 612
Calculation steps:
[( 612 - 638 ) ÷ 638] x 100 = -4.08%
Formula
Percentage change = [(612 - 638) / 638] x 100
Subtract the new number by the original number
612 - 638 = -26
-26 ÷ 638 = -0.04075235109717868
-0.04075235109717868 x 100 = -4.08%