2.34% is the change from 811 to 830
Calculation steps:
[( 830 - 811 ) ÷ 811] x 100 = 2.34%
Formula
Percentage change = [(830 - 811) / 811] x 100
Subtract the new number by the original number
830 - 811 = 19
19 ÷ 811 = 0.02342786683107275
0.02342786683107275 x 100 = 2.34%