-5.48% is the change from 675 to 638
Calculation steps:
[( 638 - 675 ) ÷ 675] x 100 = -5.48%
Formula
Percentage change = [(638 - 675) / 675] x 100
Subtract the new number by the original number
638 - 675 = -37
-37 ÷ 675 = -0.054814814814814816
-0.054814814814814816 x 100 = -5.48%