0.47% is the change from 639 to 642
Calculation steps:
[( 642 - 639 ) ÷ 639] x 100 = 0.47%
Formula
Percentage change = [(642 - 639) / 639] x 100
Subtract the new number by the original number
642 - 639 = 3
3 ÷ 639 = 0.004694835680751174
0.004694835680751174 x 100 = 0.47%