-97.26% is the change from 656 to 18
Calculation steps:
[( 18 - 656 ) ÷ 656] x 100 = -97.26%
Formula
Percentage change = [(18 - 656) / 656] x 100
Subtract the new number by the original number
18 - 656 = -638
-638 ÷ 656 = -0.9725609756097561
-0.9725609756097561 x 100 = -97.26%