2.34% is the change from 812 to 831
Calculation steps:
[( 831 - 812 ) ÷ 812] x 100 = 2.34%
Formula
Percentage change = [(831 - 812) / 812] x 100
Subtract the new number by the original number
831 - 812 = 19
19 ÷ 812 = 0.023399014778325122
0.023399014778325122 x 100 = 2.34%