-24.2% is the change from 686 to 520
Calculation steps:
[( 520 - 686 ) ÷ 686] x 100 = -24.2%
Formula
Percentage change = [(520 - 686) / 686] x 100
Subtract the new number by the original number
520 - 686 = -166
-166 ÷ 686 = -0.24198250728862974
-0.24198250728862974 x 100 = -24.2%