2.19% is the change from 640 to 654
Calculation steps:
[( 654 - 640 ) ÷ 640] x 100 = 2.19%
Formula
Percentage change = [(654 - 640) / 640] x 100
Subtract the new number by the original number
654 - 640 = 14
14 ÷ 640 = 0.021875
0.021875 x 100 = 2.19%
Example