3.43% is the change from 642 to 664
Calculation steps:
[( 664 - 642 ) ÷ 642] x 100 = 3.43%
Formula
Percentage change = [(664 - 642) / 642] x 100
Subtract the new number by the original number
664 - 642 = 22
22 ÷ 642 = 0.03426791277258567
0.03426791277258567 x 100 = 3.43%