-19.88% is the change from 518 to 415
Calculation steps:
[( 415 - 518 ) ÷ 518] x 100 = -19.88%
Formula
Percentage change = [(415 - 518) / 518] x 100
Subtract the new number by the original number
415 - 518 = -103
-103 ÷ 518 = -0.19884169884169883
-0.19884169884169883 x 100 = -19.88%