-0.15% is the change from 680 to 679
Calculation steps:
[( 679 - 680 ) ÷ 680] x 100 = -0.15%
Formula
Percentage change = [(679 - 680) / 680] x 100
Subtract the new number by the original number
679 - 680 = -1
-1 ÷ 680 = -0.0014705882352941176
-0.0014705882352941176 x 100 = -0.15%