-13.95% is the change from 638 to 549
Calculation steps:
[( 549 - 638 ) ÷ 638] x 100 = -13.95%
Formula
Percentage change = [(549 - 638) / 638] x 100
Subtract the new number by the original number
549 - 638 = -89
-89 ÷ 638 = -0.13949843260188088
-0.13949843260188088 x 100 = -13.95%