0.94% is the change from 638 to 644
Calculation steps:
[( 644 - 638 ) ÷ 638] x 100 = 0.94%
Formula
Percentage change = [(644 - 638) / 638] x 100
Subtract the new number by the original number
644 - 638 = 6
6 ÷ 638 = 0.009404388714733543
0.009404388714733543 x 100 = 0.94%