2.87% is the change from 628 to 646
Calculation steps:
[( 646 - 628 ) ÷ 628] x 100 = 2.87%
Formula
Percentage change = [(646 - 628) / 628] x 100
Subtract the new number by the original number
646 - 628 = 18
18 ÷ 628 = 0.028662420382165606
0.028662420382165606 x 100 = 2.87%