-0.47% is the change from 638 to 635
Calculation steps:
[( 635 - 638 ) ÷ 638] x 100 = -0.47%
Formula
Percentage change = [(635 - 638) / 638] x 100
Subtract the new number by the original number
635 - 638 = -3
-3 ÷ 638 = -0.004702194357366771
-0.004702194357366771 x 100 = -0.47%