-1.27% is the change from 631 to 623
Calculation steps:
[( 623 - 631 ) ÷ 631] x 100 = -1.27%
Formula
Percentage change = [(623 - 631) / 631] x 100
Subtract the new number by the original number
623 - 631 = -8
-8 ÷ 631 = -0.012678288431061807
-0.012678288431061807 x 100 = -1.27%