51.96% is the change from 639 to 971
Calculation steps:
[( 971 - 639 ) ÷ 639] x 100 = 51.96%
Formula
Percentage change = [(971 - 639) / 639] x 100
Subtract the new number by the original number
971 - 639 = 332
332 ÷ 639 = 0.5195618153364632
0.5195618153364632 x 100 = 51.96%