-2.8% is the change from 679 to 660
Calculation steps:
[( 660 - 679 ) ÷ 679] x 100 = -2.8%
Formula
Percentage change = [(660 - 679) / 679] x 100
Subtract the new number by the original number
660 - 679 = -19
-19 ÷ 679 = -0.027982326951399118
-0.027982326951399118 x 100 = -2.8%