-91.71% is the change from 217 to 18
Calculation steps:
[( 18 - 217 ) ÷ 217] x 100 = -91.71%
Formula
Percentage change = [(18 - 217) / 217] x 100
Subtract the new number by the original number
18 - 217 = -199
-199 ÷ 217 = -0.9170506912442397
-0.9170506912442397 x 100 = -91.71%