51.17% is the change from 639 to 966
Calculation steps:
[( 966 - 639 ) ÷ 639] x 100 = 51.17%
Formula
Percentage change = [(966 - 639) / 639] x 100
Subtract the new number by the original number
966 - 639 = 327
327 ÷ 639 = 0.5117370892018779
0.5117370892018779 x 100 = 51.17%