-0.15% is the change from 660 to 659
Calculation steps:
[( 659 - 660 ) ÷ 660] x 100 = -0.15%
Formula
Percentage change = [(659 - 660) / 660] x 100
Subtract the new number by the original number
659 - 660 = -1
-1 ÷ 660 = -0.0015151515151515152
-0.0015151515151515152 x 100 = -0.15%