-4.86% is the change from 638 to 607
Calculation steps:
[( 607 - 638 ) ÷ 638] x 100 = -4.86%
Formula
Percentage change = [(607 - 638) / 638] x 100
Subtract the new number by the original number
607 - 638 = -31
-31 ÷ 638 = -0.048589341692789965
-0.048589341692789965 x 100 = -4.86%