31.4% is the change from 621 to 816
Calculation steps:
[( 816 - 621 ) ÷ 621] x 100 = 31.4%
Formula
Percentage change = [(816 - 621) / 621] x 100
Subtract the new number by the original number
816 - 621 = 195
195 ÷ 621 = 0.3140096618357488
0.3140096618357488 x 100 = 31.4%