-6.6% is the change from 667 to 623
Calculation steps:
[( 623 - 667 ) ÷ 667] x 100 = -6.6%
Formula
Percentage change = [(623 - 667) / 667] x 100
Subtract the new number by the original number
623 - 667 = -44
-44 ÷ 667 = -0.06596701649175413
-0.06596701649175413 x 100 = -6.6%