2.94% is the change from 647 to 666
Calculation steps:
[( 666 - 647 ) ÷ 647] x 100 = 2.94%
Formula
Percentage change = [(666 - 647) / 647] x 100
Subtract the new number by the original number
666 - 647 = 19
19 ÷ 647 = 0.02936630602782071
0.02936630602782071 x 100 = 2.94%