3.31% is the change from 604 to 624
Calculation steps:
[( 624 - 604 ) ÷ 604] x 100 = 3.31%
Formula
Percentage change = [(624 - 604) / 604] x 100
Subtract the new number by the original number
624 - 604 = 20
20 ÷ 604 = 0.033112582781456956
0.033112582781456956 x 100 = 3.31%