31.07% is the change from 634 to 831
Calculation steps:
[( 831 - 634 ) ÷ 634] x 100 = 31.07%
Formula
Percentage change = [(831 - 634) / 634] x 100
Subtract the new number by the original number
831 - 634 = 197
197 ÷ 634 = 0.3107255520504732
0.3107255520504732 x 100 = 31.07%