-90.15% is the change from 518 to 51
Calculation steps:
[( 51 - 518 ) ÷ 518] x 100 = -90.15%
Formula
Percentage change = [(51 - 518) / 518] x 100
Subtract the new number by the original number
51 - 518 = -467
-467 ÷ 518 = -0.9015444015444015
-0.9015444015444015 x 100 = -90.15%