-16.51% is the change from 624 to 521
Calculation steps:
[( 521 - 624 ) ÷ 624] x 100 = -16.51%
Formula
Percentage change = [(521 - 624) / 624] x 100
Subtract the new number by the original number
521 - 624 = -103
-103 ÷ 624 = -0.16506410256410256
-0.16506410256410256 x 100 = -16.51%