-2.51% is the change from 677 to 660
Calculation steps:
[( 660 - 677 ) ÷ 677] x 100 = -2.51%
Formula
Percentage change = [(660 - 677) / 677] x 100
Subtract the new number by the original number
660 - 677 = -17
-17 ÷ 677 = -0.025110782865583457
-0.025110782865583457 x 100 = -2.51%