-1.47% is the change from 678 to 668
Calculation steps:
[( 668 - 678 ) ÷ 678] x 100 = -1.47%
Formula
Percentage change = [(668 - 678) / 678] x 100
Subtract the new number by the original number
668 - 678 = -10
-10 ÷ 678 = -0.014749262536873156
-0.014749262536873156 x 100 = -1.47%