-97.38% is the change from 686 to 18
Calculation steps:
[( 18 - 686 ) ÷ 686] x 100 = -97.38%
Formula
Percentage change = [(18 - 686) / 686] x 100
Subtract the new number by the original number
18 - 686 = -668
-668 ÷ 686 = -0.9737609329446064
-0.9737609329446064 x 100 = -97.38%