-90.81% is the change from 555 to 51
Calculation steps:
[( 51 - 555 ) ÷ 555] x 100 = -90.81%
Formula
Percentage change = [(51 - 555) / 555] x 100
Subtract the new number by the original number
51 - 555 = -504
-504 ÷ 555 = -0.9081081081081082
-0.9081081081081082 x 100 = -90.81%