31.71% is the change from 637 to 839
Calculation steps:
[( 839 - 637 ) ÷ 637] x 100 = 31.71%
Formula
Percentage change = [(839 - 637) / 637] x 100
Subtract the new number by the original number
839 - 637 = 202
202 ÷ 637 = 0.31711145996860285
0.31711145996860285 x 100 = 31.71%