27.07% is the change from 639 to 812
Calculation steps:
[( 812 - 639 ) ÷ 639] x 100 = 27.07%
Formula
Percentage change = [(812 - 639) / 639] x 100
Subtract the new number by the original number
812 - 639 = 173
173 ÷ 639 = 0.27073552425665104
0.27073552425665104 x 100 = 27.07%