-2.34% is the change from 684 to 668
Calculation steps:
[( 668 - 684 ) ÷ 684] x 100 = -2.34%
Formula
Percentage change = [(668 - 684) / 684] x 100
Subtract the new number by the original number
668 - 684 = -16
-16 ÷ 684 = -0.023391812865497075
-0.023391812865497075 x 100 = -2.34%