-2.65% is the change from 680 to 662
Calculation steps:
[( 662 - 680 ) ÷ 680] x 100 = -2.65%
Formula
Percentage change = [(662 - 680) / 680] x 100
Subtract the new number by the original number
662 - 680 = -18
-18 ÷ 680 = -0.026470588235294117
-0.026470588235294117 x 100 = -2.65%