20.81% is the change from 639 to 772
Calculation steps:
[( 772 - 639 ) ÷ 639] x 100 = 20.81%
Formula
Percentage change = [(772 - 639) / 639] x 100
Subtract the new number by the original number
772 - 639 = 133
133 ÷ 639 = 0.2081377151799687
0.2081377151799687 x 100 = 20.81%