3.05% is the change from 623 to 642
Calculation steps:
[( 642 - 623 ) ÷ 623] x 100 = 3.05%
Formula
Percentage change = [(642 - 623) / 623] x 100
Subtract the new number by the original number
642 - 623 = 19
19 ÷ 623 = 0.030497592295345103
0.030497592295345103 x 100 = 3.05%