3.31% is the change from 635 to 656
Calculation steps:
[( 656 - 635 ) ÷ 635] x 100 = 3.31%
Formula
Percentage change = [(656 - 635) / 635] x 100
Subtract the new number by the original number
656 - 635 = 21
21 ÷ 635 = 0.03307086614173228
0.03307086614173228 x 100 = 3.31%