2.57% is the change from 817 to 838
Calculation steps:
[( 838 - 817 ) ÷ 817] x 100 = 2.57%
Formula
Percentage change = [(838 - 817) / 817] x 100
Subtract the new number by the original number
838 - 817 = 21
21 ÷ 817 = 0.025703794369645042
0.025703794369645042 x 100 = 2.57%