-91.86% is the change from 221 to 18
Calculation steps:
[( 18 - 221 ) ÷ 221] x 100 = -91.86%
Formula
Percentage change = [(18 - 221) / 221] x 100
Subtract the new number by the original number
18 - 221 = -203
-203 ÷ 221 = -0.918552036199095
-0.918552036199095 x 100 = -91.86%