31.88% is the change from 621 to 819
Calculation steps:
[( 819 - 621 ) ÷ 621] x 100 = 31.88%
Formula
Percentage change = [(819 - 621) / 621] x 100
Subtract the new number by the original number
819 - 621 = 198
198 ÷ 621 = 0.3188405797101449
0.3188405797101449 x 100 = 31.88%