-97.29% is the change from 665 to 18
Calculation steps:
[( 18 - 665 ) ÷ 665] x 100 = -97.29%
Formula
Percentage change = [(18 - 665) / 665] x 100
Subtract the new number by the original number
18 - 665 = -647
-647 ÷ 665 = -0.9729323308270676
-0.9729323308270676 x 100 = -97.29%