-5.2% is the change from 673 to 638
Calculation steps:
[( 638 - 673 ) ÷ 673] x 100 = -5.2%
Formula
Percentage change = [(638 - 673) / 673] x 100
Subtract the new number by the original number
638 - 673 = -35
-35 ÷ 673 = -0.05200594353640416
-0.05200594353640416 x 100 = -5.2%