-97.31% is the change from 669 to 18
Calculation steps:
[( 18 - 669 ) ÷ 669] x 100 = -97.31%
Formula
Percentage change = [(18 - 669) / 669] x 100
Subtract the new number by the original number
18 - 669 = -651
-651 ÷ 669 = -0.9730941704035875
-0.9730941704035875 x 100 = -97.31%