-97.32% is the change from 671 to 18
Calculation steps:
[( 18 - 671 ) ÷ 671] x 100 = -97.32%
Formula
Percentage change = [(18 - 671) / 671] x 100
Subtract the new number by the original number
18 - 671 = -653
-653 ÷ 671 = -0.9731743666169895
-0.9731743666169895 x 100 = -97.32%