-18.84% is the change from 621 to 504
Calculation steps:
[( 504 - 621 ) ÷ 621] x 100 = -18.84%
Formula
Percentage change = [(504 - 621) / 621] x 100
Subtract the new number by the original number
504 - 621 = -117
-117 ÷ 621 = -0.18840579710144928
-0.18840579710144928 x 100 = -18.84%