3.15% is the change from 635 to 655
Calculation steps:
[( 655 - 635 ) ÷ 635] x 100 = 3.15%
Formula
Percentage change = [(655 - 635) / 635] x 100
Subtract the new number by the original number
655 - 635 = 20
20 ÷ 635 = 0.031496062992125984
0.031496062992125984 x 100 = 3.15%