-24.49% is the change from 686 to 518
Calculation steps:
[( 518 - 686 ) ÷ 686] x 100 = -24.49%
Formula
Percentage change = [(518 - 686) / 686] x 100
Subtract the new number by the original number
518 - 686 = -168
-168 ÷ 686 = -0.24489795918367346
-0.24489795918367346 x 100 = -24.49%