27.23% is the change from 639 to 813
Calculation steps:
[( 813 - 639 ) ÷ 639] x 100 = 27.23%
Formula
Percentage change = [(813 - 639) / 639] x 100
Subtract the new number by the original number
813 - 639 = 174
174 ÷ 639 = 0.27230046948356806
0.27230046948356806 x 100 = 27.23%