-0.15% is the change from 649 to 648
Calculation steps:
[( 648 - 649 ) ÷ 649] x 100 = -0.15%
Formula
Percentage change = [(648 - 649) / 649] x 100
Subtract the new number by the original number
648 - 649 = -1
-1 ÷ 649 = -0.0015408320493066256
-0.0015408320493066256 x 100 = -0.15%