-99.23% is the change from 518 to 4
Calculation steps:
[( 4 - 518 ) ÷ 518] x 100 = -99.23%
Formula
Percentage change = [(4 - 518) / 518] x 100
Subtract the new number by the original number
4 - 518 = -514
-514 ÷ 518 = -0.9922779922779923
-0.9922779922779923 x 100 = -99.23%