20.03% is the change from 639 to 767
Calculation steps:
[( 767 - 639 ) ÷ 639] x 100 = 20.03%
Formula
Percentage change = [(767 - 639) / 639] x 100
Subtract the new number by the original number
767 - 639 = 128
128 ÷ 639 = 0.20031298904538342
0.20031298904538342 x 100 = 20.03%