3.9% is the change from 641 to 666
Calculation steps:
[( 666 - 641 ) ÷ 641] x 100 = 3.9%
Formula
Percentage change = [(666 - 641) / 641] x 100
Subtract the new number by the original number
666 - 641 = 25
25 ÷ 641 = 0.0390015600624025
0.0390015600624025 x 100 = 3.9%