-91.39% is the change from 209 to 18
Calculation steps:
[( 18 - 209 ) ÷ 209] x 100 = -91.39%
Formula
Percentage change = [(18 - 209) / 209] x 100
Subtract the new number by the original number
18 - 209 = -191
-191 ÷ 209 = -0.9138755980861244
-0.9138755980861244 x 100 = -91.39%