-9.73% is the change from 555 to 501
Calculation steps:
[( 501 - 555 ) ÷ 555] x 100 = -9.73%
Formula
Percentage change = [(501 - 555) / 555] x 100
Subtract the new number by the original number
501 - 555 = -54
-54 ÷ 555 = -0.0972972972972973
-0.0972972972972973 x 100 = -9.73%