19.68% is the change from 686 to 821
Calculation steps:
[( 821 - 686 ) ÷ 686] x 100 = 19.68%
Formula
Percentage change = [(821 - 686) / 686] x 100
Subtract the new number by the original number
821 - 686 = 135
135 ÷ 686 = 0.1967930029154519
0.1967930029154519 x 100 = 19.68%