-1.33% is the change from 677 to 668
Calculation steps:
[( 668 - 677 ) ÷ 677] x 100 = -1.33%
Formula
Percentage change = [(668 - 677) / 677] x 100
Subtract the new number by the original number
668 - 677 = -9
-9 ÷ 677 = -0.013293943870014771
-0.013293943870014771 x 100 = -1.33%