31.78% is the change from 623 to 821
Calculation steps:
[( 821 - 623 ) ÷ 623] x 100 = 31.78%
Formula
Percentage change = [(821 - 623) / 623] x 100
Subtract the new number by the original number
821 - 623 = 198
198 ÷ 623 = 0.31781701444622795
0.31781701444622795 x 100 = 31.78%