-3.5% is the change from 686 to 662
Calculation steps:
[( 662 - 686 ) ÷ 686] x 100 = -3.5%
Formula
Percentage change = [(662 - 686) / 686] x 100
Subtract the new number by the original number
662 - 686 = -24
-24 ÷ 686 = -0.03498542274052478
-0.03498542274052478 x 100 = -3.5%