-99.85% is the change from 680 to 1
Calculation steps:
[( 1 - 680 ) ÷ 680] x 100 = -99.85%
Formula
Percentage change = [(1 - 680) / 680] x 100
Subtract the new number by the original number
1 - 680 = -679
-679 ÷ 680 = -0.9985294117647059
-0.9985294117647059 x 100 = -99.85%