3.1% is the change from 806 to 831
Calculation steps:
[( 831 - 806 ) ÷ 806] x 100 = 3.1%
Formula
Percentage change = [(831 - 806) / 806] x 100
Subtract the new number by the original number
831 - 806 = 25
25 ÷ 806 = 0.031017369727047148
0.031017369727047148 x 100 = 3.1%