-0.15% is the change from 685 to 684
Calculation steps:
[( 684 - 685 ) ÷ 685] x 100 = -0.15%
Formula
Percentage change = [(684 - 685) / 685] x 100
Subtract the new number by the original number
684 - 685 = -1
-1 ÷ 685 = -0.00145985401459854
-0.00145985401459854 x 100 = -0.15%