2.35% is the change from 639 to 654
Calculation steps:
[( 654 - 639 ) ÷ 639] x 100 = 2.35%
Formula
Percentage change = [(654 - 639) / 639] x 100
Subtract the new number by the original number
654 - 639 = 15
15 ÷ 639 = 0.023474178403755867
0.023474178403755867 x 100 = 2.35%