28.01% is the change from 639 to 818
Calculation steps:
[( 818 - 639 ) ÷ 639] x 100 = 28.01%
Formula
Percentage change = [(818 - 639) / 639] x 100
Subtract the new number by the original number
818 - 639 = 179
179 ÷ 639 = 0.28012519561815336
0.28012519561815336 x 100 = 28.01%