4.38% is the change from 639 to 667
Calculation steps:
[( 667 - 639 ) ÷ 639] x 100 = 4.38%
Formula
Percentage change = [(667 - 639) / 639] x 100
Subtract the new number by the original number
667 - 639 = 28
28 ÷ 639 = 0.04381846635367762
0.04381846635367762 x 100 = 4.38%