-18.82% is the change from 271 to 220
Calculation steps:
[( 220 - 271 ) ÷ 271] x 100 = -18.82%
Formula
Percentage change = [(220 - 271) / 271] x 100
Subtract the new number by the original number
220 - 271 = -51
-51 ÷ 271 = -0.1881918819188192
-0.1881918819188192 x 100 = -18.82%