-1.62% is the change from 679 to 668
Calculation steps:
[( 668 - 679 ) ÷ 679] x 100 = -1.62%
Formula
Percentage change = [(668 - 679) / 679] x 100
Subtract the new number by the original number
668 - 679 = -11
-11 ÷ 679 = -0.016200294550810016
-0.016200294550810016 x 100 = -1.62%