-18.03% is the change from 549 to 450
Calculation steps:
[( 450 - 549 ) ÷ 549] x 100 = -18.03%
Formula
Percentage change = [(450 - 549) / 549] x 100
Subtract the new number by the original number
450 - 549 = -99
-99 ÷ 549 = -0.18032786885245902
-0.18032786885245902 x 100 = -18.03%