20.88% is the change from 819 to 990
Calculation steps:
[( 990 - 819 ) ÷ 819] x 100 = 20.88%
Formula
Percentage change = [(990 - 819) / 819] x 100
Subtract the new number by the original number
990 - 819 = 171
171 ÷ 819 = 0.2087912087912088
0.2087912087912088 x 100 = 20.88%