-1.27% is the change from 629 to 621
Calculation steps:
[( 621 - 629 ) ÷ 629] x 100 = -1.27%
Formula
Percentage change = [(621 - 629) / 629] x 100
Subtract the new number by the original number
621 - 629 = -8
-8 ÷ 629 = -0.012718600953895072
-0.012718600953895072 x 100 = -1.27%