19.97% is the change from 686 to 823
Calculation steps:
[( 823 - 686 ) ÷ 686] x 100 = 19.97%
Formula
Percentage change = [(823 - 686) / 686] x 100
Subtract the new number by the original number
823 - 686 = 137
137 ÷ 686 = 0.19970845481049562
0.19970845481049562 x 100 = 19.97%