-1.76% is the change from 680 to 668
Calculation steps:
[( 668 - 680 ) ÷ 680] x 100 = -1.76%
Formula
Percentage change = [(668 - 680) / 680] x 100
Subtract the new number by the original number
668 - 680 = -12
-12 ÷ 680 = -0.01764705882352941
-0.01764705882352941 x 100 = -1.76%