-6.04% is the change from 679 to 638
Calculation steps:
[( 638 - 679 ) ÷ 679] x 100 = -6.04%
Formula
Percentage change = [(638 - 679) / 679] x 100
Subtract the new number by the original number
638 - 679 = -41
-41 ÷ 679 = -0.060382916053019146
-0.060382916053019146 x 100 = -6.04%