-97.37% is the change from 685 to 18
Calculation steps:
[( 18 - 685 ) ÷ 685] x 100 = -97.37%
Formula
Percentage change = [(18 - 685) / 685] x 100
Subtract the new number by the original number
18 - 685 = -667
-667 ÷ 685 = -0.9737226277372263
-0.9737226277372263 x 100 = -97.37%