-93.36% is the change from 271 to 18
Calculation steps:
[( 18 - 271 ) ÷ 271] x 100 = -93.36%
Formula
Percentage change = [(18 - 271) / 271] x 100
Subtract the new number by the original number
18 - 271 = -253
-253 ÷ 271 = -0.933579335793358
-0.933579335793358 x 100 = -93.36%