21.16% is the change from 671 to 813
Calculation steps:
[( 813 - 671 ) ÷ 671] x 100 = 21.16%
Formula
Percentage change = [(813 - 671) / 671] x 100
Subtract the new number by the original number
813 - 671 = 142
142 ÷ 671 = 0.21162444113263784
0.21162444113263784 x 100 = 21.16%