2.98% is the change from 638 to 657
Calculation steps:
[( 657 - 638 ) ÷ 638] x 100 = 2.98%
Formula
Percentage change = [(657 - 638) / 638] x 100
Subtract the new number by the original number
657 - 638 = 19
19 ÷ 638 = 0.029780564263322883
0.029780564263322883 x 100 = 2.98%