52.9% is the change from 639 to 977
Calculation steps:
[( 977 - 639 ) ÷ 639] x 100 = 52.9%
Formula
Percentage change = [(977 - 639) / 639] x 100
Subtract the new number by the original number
977 - 639 = 338
338 ÷ 639 = 0.5289514866979655
0.5289514866979655 x 100 = 52.9%