20.58% is the change from 821 to 990
Calculation steps:
[( 990 - 821 ) ÷ 821] x 100 = 20.58%
Formula
Percentage change = [(990 - 821) / 821] x 100
Subtract the new number by the original number
990 - 821 = 169
169 ÷ 821 = 0.20584652862362973
0.20584652862362973 x 100 = 20.58%