8.15% is the change from 638 to 690
Calculation steps:
[( 690 - 638 ) ÷ 638] x 100 = 8.15%
Formula
Percentage change = [(690 - 638) / 638] x 100
Subtract the new number by the original number
690 - 638 = 52
52 ÷ 638 = 0.08150470219435736
0.08150470219435736 x 100 = 8.15%