-6.13% is the change from 555 to 521
Calculation steps:
[( 521 - 555 ) ÷ 555] x 100 = -6.13%
Formula
Percentage change = [(521 - 555) / 555] x 100
Subtract the new number by the original number
521 - 555 = -34
-34 ÷ 555 = -0.06126126126126126
-0.06126126126126126 x 100 = -6.13%