-0.6% is the change from 672 to 668
Calculation steps:
[( 668 - 672 ) ÷ 672] x 100 = -0.6%
Formula
Percentage change = [(668 - 672) / 672] x 100
Subtract the new number by the original number
668 - 672 = -4
-4 ÷ 672 = -0.005952380952380952
-0.005952380952380952 x 100 = -0.6%