0.3% is the change from 666 to 668
Calculation steps:
[( 668 - 666 ) ÷ 666] x 100 = 0.3%
Formula
Percentage change = [(668 - 666) / 666] x 100
Subtract the new number by the original number
668 - 666 = 2
2 ÷ 666 = 0.003003003003003003
0.003003003003003003 x 100 = 0.3%