-19.39% is the change from 624 to 503
Calculation steps:
[( 503 - 624 ) ÷ 624] x 100 = -19.39%
Formula
Percentage change = [(503 - 624) / 624] x 100
Subtract the new number by the original number
503 - 624 = -121
-121 ÷ 624 = -0.19391025641025642
-0.19391025641025642 x 100 = -19.39%