-3.49% is the change from 687 to 663
Calculation steps:
[( 663 - 687 ) ÷ 687] x 100 = -3.49%
Formula
Percentage change = [(663 - 687) / 687] x 100
Subtract the new number by the original number
663 - 687 = -24
-24 ÷ 687 = -0.034934497816593885
-0.034934497816593885 x 100 = -3.49%