-8.82% is the change from 680 to 620
Calculation steps:
[( 620 - 680 ) ÷ 680] x 100 = -8.82%
Formula
Percentage change = [(620 - 680) / 680] x 100
Subtract the new number by the original number
620 - 680 = -60
-60 ÷ 680 = -0.08823529411764706
-0.08823529411764706 x 100 = -8.82%