21.1% is the change from 673 to 815
Calculation steps:
[( 815 - 673 ) ÷ 673] x 100 = 21.1%
Formula
Percentage change = [(815 - 673) / 673] x 100
Subtract the new number by the original number
815 - 673 = 142
142 ÷ 673 = 0.21099554234769688
0.21099554234769688 x 100 = 21.1%