21.91% is the change from 671 to 818
Calculation steps:
[( 818 - 671 ) ÷ 671] x 100 = 21.91%
Formula
Percentage change = [(818 - 671) / 671] x 100
Subtract the new number by the original number
818 - 671 = 147
147 ÷ 671 = 0.21907600596125187
0.21907600596125187 x 100 = 21.91%