-1.32% is the change from 680 to 671
Calculation steps:
[( 671 - 680 ) ÷ 680] x 100 = -1.32%
Formula
Percentage change = [(671 - 680) / 680] x 100
Subtract the new number by the original number
671 - 680 = -9
-9 ÷ 680 = -0.013235294117647059
-0.013235294117647059 x 100 = -1.32%