2.58% is the change from 813 to 834
Calculation steps:
[( 834 - 813 ) ÷ 813] x 100 = 2.58%
Formula
Percentage change = [(834 - 813) / 813] x 100
Subtract the new number by the original number
834 - 813 = 21
21 ÷ 813 = 0.025830258302583026
0.025830258302583026 x 100 = 2.58%