20.7% is the change from 686 to 828
Calculation steps:
[( 828 - 686 ) ÷ 686] x 100 = 20.7%
Formula
Percentage change = [(828 - 686) / 686] x 100
Subtract the new number by the original number
828 - 686 = 142
142 ÷ 686 = 0.20699708454810495
0.20699708454810495 x 100 = 20.7%