-19% is the change from 621 to 503
Calculation steps:
[( 503 - 621 ) ÷ 621] x 100 = -19%
Formula
Percentage change = [(503 - 621) / 621] x 100
Subtract the new number by the original number
503 - 621 = -118
-118 ÷ 621 = -0.19001610305958133
-0.19001610305958133 x 100 = -19%