-3.35% is the change from 686 to 663
Calculation steps:
[( 663 - 686 ) ÷ 686] x 100 = -3.35%
Formula
Percentage change = [(663 - 686) / 686] x 100
Subtract the new number by the original number
663 - 686 = -23
-23 ÷ 686 = -0.033527696793002916
-0.033527696793002916 x 100 = -3.35%