-97.22% is the change from 648 to 18
Calculation steps:
[( 18 - 648 ) ÷ 648] x 100 = -97.22%
Formula
Percentage change = [(18 - 648) / 648] x 100
Subtract the new number by the original number
18 - 648 = -630
-630 ÷ 648 = -0.9722222222222222
-0.9722222222222222 x 100 = -97.22%