49.92% is the change from 639 to 958
Calculation steps:
[( 958 - 639 ) ÷ 639] x 100 = 49.92%
Formula
Percentage change = [(958 - 639) / 639] x 100
Subtract the new number by the original number
958 - 639 = 319
319 ÷ 639 = 0.49921752738654146
0.49921752738654146 x 100 = 49.92%