20.03% is the change from 684 to 821
Calculation steps:
[( 821 - 684 ) ÷ 684] x 100 = 20.03%
Formula
Percentage change = [(821 - 684) / 684] x 100
Subtract the new number by the original number
821 - 684 = 137
137 ÷ 684 = 0.20029239766081872
0.20029239766081872 x 100 = 20.03%