-2.7% is the change from 518 to 504
Calculation steps:
[( 504 - 518 ) ÷ 518] x 100 = -2.7%
Formula
Percentage change = [(504 - 518) / 518] x 100
Subtract the new number by the original number
504 - 518 = -14
-14 ÷ 518 = -0.02702702702702703
-0.02702702702702703 x 100 = -2.7%