0.15% is the change from 665 to 666
Calculation steps:
[( 666 - 665 ) ÷ 665] x 100 = 0.15%
Formula
Percentage change = [(666 - 665) / 665] x 100
Subtract the new number by the original number
666 - 665 = 1
1 ÷ 665 = 0.0015037593984962407
0.0015037593984962407 x 100 = 0.15%