-20.29% is the change from 631 to 503
Calculation steps:
[( 503 - 631 ) ÷ 631] x 100 = -20.29%
Formula
Percentage change = [(503 - 631) / 631] x 100
Subtract the new number by the original number
503 - 631 = -128
-128 ÷ 631 = -0.20285261489698891
-0.20285261489698891 x 100 = -20.29%