50.31% is the change from 638 to 959
Calculation steps:
[( 959 - 638 ) ÷ 638] x 100 = 50.31%
Formula
Percentage change = [(959 - 638) / 638] x 100
Subtract the new number by the original number
959 - 638 = 321
321 ÷ 638 = 0.5031347962382445
0.5031347962382445 x 100 = 50.31%