50.7% is the change from 639 to 963
Calculation steps:
[( 963 - 639 ) ÷ 639] x 100 = 50.7%
Formula
Percentage change = [(963 - 639) / 639] x 100
Subtract the new number by the original number
963 - 639 = 324
324 ÷ 639 = 0.5070422535211268
0.5070422535211268 x 100 = 50.7%