3.42% is the change from 644 to 666
Calculation steps:
[( 666 - 644 ) ÷ 644] x 100 = 3.42%
Formula
Percentage change = [(666 - 644) / 644] x 100
Subtract the new number by the original number
666 - 644 = 22
22 ÷ 644 = 0.034161490683229816
0.034161490683229816 x 100 = 3.42%