3.53% is the change from 624 to 646
Calculation steps:
[( 646 - 624 ) ÷ 624] x 100 = 3.53%
Formula
Percentage change = [(646 - 624) / 624] x 100
Subtract the new number by the original number
646 - 624 = 22
22 ÷ 624 = 0.035256410256410256
0.035256410256410256 x 100 = 3.53%