-24.93% is the change from 686 to 515
Calculation steps:
[( 515 - 686 ) ÷ 686] x 100 = -24.93%
Formula
Percentage change = [(515 - 686) / 686] x 100
Subtract the new number by the original number
515 - 686 = -171
-171 ÷ 686 = -0.24927113702623907
-0.24927113702623907 x 100 = -24.93%