31.08% is the change from 637 to 835
Calculation steps:
[( 835 - 637 ) ÷ 637] x 100 = 31.08%
Formula
Percentage change = [(835 - 637) / 637] x 100
Subtract the new number by the original number
835 - 637 = 198
198 ÷ 637 = 0.3108320251177394
0.3108320251177394 x 100 = 31.08%