-99.85% is the change from 685 to 1
Calculation steps:
[( 1 - 685 ) ÷ 685] x 100 = -99.85%
Formula
Percentage change = [(1 - 685) / 685] x 100
Subtract the new number by the original number
1 - 685 = -684
-684 ÷ 685 = -0.9985401459854014
-0.9985401459854014 x 100 = -99.85%