-0.15% is the change from 648 to 647
Calculation steps:
[( 647 - 648 ) ÷ 648] x 100 = -0.15%
Formula
Percentage change = [(647 - 648) / 648] x 100
Subtract the new number by the original number
647 - 648 = -1
-1 ÷ 648 = -0.0015432098765432098
-0.0015432098765432098 x 100 = -0.15%