-2.4% is the change from 624 to 609
Calculation steps:
[( 609 - 624 ) ÷ 624] x 100 = -2.4%
Formula
Percentage change = [(609 - 624) / 624] x 100
Subtract the new number by the original number
609 - 624 = -15
-15 ÷ 624 = -0.02403846153846154
-0.02403846153846154 x 100 = -2.4%