0.15% is the change from 668 to 669
Calculation steps:
[( 669 - 668 ) ÷ 668] x 100 = 0.15%
Formula
Percentage change = [(669 - 668) / 668] x 100
Subtract the new number by the original number
669 - 668 = 1
1 ÷ 668 = 0.0014970059880239522
0.0014970059880239522 x 100 = 0.15%