-19.58% is the change from 623 to 501
Calculation steps:
[( 501 - 623 ) ÷ 623] x 100 = -19.58%
Formula
Percentage change = [(501 - 623) / 623] x 100
Subtract the new number by the original number
501 - 623 = -122
-122 ÷ 623 = -0.1958266452648475
-0.1958266452648475 x 100 = -19.58%