9.23% is the change from 585 to 639
Calculation steps:
[( 639 - 585 ) ÷ 585] x 100 = 9.23%
Formula
Percentage change = [(639 - 585) / 585] x 100
Subtract the new number by the original number
639 - 585 = 54
54 ÷ 585 = 0.09230769230769231
0.09230769230769231 x 100 = 9.23%