45.7% is the change from 639 to 931
Calculation steps:
[( 931 - 639 ) ÷ 639] x 100 = 45.7%
Formula
Percentage change = [(931 - 639) / 639] x 100
Subtract the new number by the original number
931 - 639 = 292
292 ÷ 639 = 0.4569640062597809
0.4569640062597809 x 100 = 45.7%