3.29% is the change from 638 to 659
Calculation steps:
[( 659 - 638 ) ÷ 638] x 100 = 3.29%
Formula
Percentage change = [(659 - 638) / 638] x 100
Subtract the new number by the original number
659 - 638 = 21
21 ÷ 638 = 0.032915360501567396
0.032915360501567396 x 100 = 3.29%