-20.9% is the change from 555 to 439
Calculation steps:
[( 439 - 555 ) ÷ 555] x 100 = -20.9%
Formula
Percentage change = [(439 - 555) / 555] x 100
Subtract the new number by the original number
439 - 555 = -116
-116 ÷ 555 = -0.209009009009009
-0.209009009009009 x 100 = -20.9%