21.57% is the change from 686 to 834
Calculation steps:
[( 834 - 686 ) ÷ 686] x 100 = 21.57%
Formula
Percentage change = [(834 - 686) / 686] x 100
Subtract the new number by the original number
834 - 686 = 148
148 ÷ 686 = 0.21574344023323616
0.21574344023323616 x 100 = 21.57%