0.15% is the change from 666 to 667
Calculation steps:
[( 667 - 666 ) ÷ 666] x 100 = 0.15%
Formula
Percentage change = [(667 - 666) / 666] x 100
Subtract the new number by the original number
667 - 666 = 1
1 ÷ 666 = 0.0015015015015015015
0.0015015015015015015 x 100 = 0.15%