-9.18% is the change from 686 to 623
Calculation steps:
[( 623 - 686 ) ÷ 686] x 100 = -9.18%
Formula
Percentage change = [(623 - 686) / 686] x 100
Subtract the new number by the original number
623 - 686 = -63
-63 ÷ 686 = -0.09183673469387756
-0.09183673469387756 x 100 = -9.18%